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Equations
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6.1 Solving Algebraic Equations
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Solutions of general algebraic equations may be found using the Solve command. The command is easy to use, but one must be careful to use a double equal sign, , between the left- and right-hand sides of the equation. (Recall that the double equal sign is a logical equality: lhs rhs has a value of True if and only if lhs and rhs have the same value, False otherwise.)
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Solve[equations, variables] attempts to solve equations for variables.
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The roots determined by Solve are expressed as of a list of the form
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x1},{x x2}, ...}
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The notation x x1 indicates that the solution, x, is x1, but x is not replaced by this value. If the equation has roots of multiplicity m > 1, each is repeated m times. If only one variable is present, variables may be omitted.
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EXAMPLE 1 In this example, there is only one variable so the specification of variables is unnecessary.
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Solve[7 x + 3 3 x + 8]
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x 5 4
If we solve the equation ax = b for x, Solve tells us that x = b/a. However, if a = b = 0, then every number x is a solution. The command Reduce can be used to describe all possible solutions. Reduce[equations, variables] simplifies equations, attempting to solve for variables. If equations is an identity, Reduce returns the value True. If equations is a contradiction, the value False is returned.
In describing the solutions, Reduce uses the symbols && (logical and) and || (logical or). && takes precedence over ||.
EXAMPLE 2
Solve[a x b, x]
x b a
Reduce[a x b, x] (b 0 & &a 0)|| a 0 & & x b a Reduce[x2 9 (x + 3)(x 3), x] True Reduce[x2 10 (x + 3)(x 3), x] False
Either a = b = 0 or a 0 and x = b/a.
Equations
If we try to solve an equation that contains two or more variables, we must specify which variable we are solving for.
EXAMPLE 3
Note the space between a and y and between c and x. This is important. may be used instead.
Solve[a y + b c x + d]
Solve svars : Equations may not give solutions for all "solve" variables.
d + c x a y }}
We must specify which variable we wish to solve for: Solve[a y + b c x + d, x] x b d +a y c Solve[a y + b c x + d, y]
y b + d + c x a
Solve[a y + b c x + d, b]
d + c x a y}} b c x + a y}}
Solve[a y + b c x + d, d]
For systems of equations, equations is a list of the form {equation1, equation2, . . .} and variables represents either a single variable or a list of several. Alternatively, equations may be represented by the individual equations separated by && (logical and).
EXAMPLE 4 Here is an easy example that shows how to solve a simple system:
2 x + 3 y = 7 3 x + 4 y = 10
Solve[{2 x + 3 y 7, 3 x + 4 y 10}, {x, y}] or Solve[2 x + 3 y 7 && 3 x + 4 y 10, {x, y}]
2, y 1}}
In this example, the specification of {x, y} is not necessary because we do not have more variables than equations. If you have more unknown variables than equations, you must specify which variables you wish to solve for. Otherwise you get Mathematica s default.
EXAMPLE 5
Solve[{x + 2 y + z 5, 2 x + y + 3 z 7}, {y, z}]
y 8 x , z 3( 3+ x) 5 5
Of course, Solve is not limited to solving only linear equations.
EXAMPLE 6
Solve[a x2 + b x + c 0, x] b b2 4ac b + b2 4ac x , x 2a 2a
Observe that Mathematica gives the general solution in terms of arbitrary a, b, and c unless values are assigned to these variables.
Equations
EXAMPLE 7
Solve[x3 + y2 5 && x + y 3]
{{y 2, x 1}, {y 4
5, x 1 + 5 , y 4 + 5, x 1 5
Because Mathematica returns the solutions of equations as a nested list, they cannot be used directly as input to other mathematical structures. However, we can access their values without unnecessary typing or pasting by using /. If we wish to compute the value of an expression using the solutions obtained from Solve, we can use the /. replacement operator and Mathematica will substitute the appropriate values.
x2 + y = 5 EXAMPLE 8 Suppose we wish to solve the equations and compute the values of the expression x 2 + y 2 . x+y =3 We use the Solve command and the object solutions for convenience. solutions = Solve[{x2 + y 5, x + y 3},{x, y}]
1, x 2}, {y 4, x 1}}
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