-x^2-10x=21

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Solution for -x^2-10x=21 equation:


Simplifying
-1x2 + -10x = 21

Reorder the terms:
-10x + -1x2 = 21

Solving
-10x + -1x2 = 21

Solving for variable 'x'.

Reorder the terms:
-21 + -10x + -1x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + -10x + -1x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(21 + 10x + x2) = 0

Factor a trinomial.
-1((7 + x)(3 + x)) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(7 + x)' equal to zero and attempt to solve: Simplifying 7 + x = 0 Solving 7 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + x = 0 + -7 x = 0 + -7 Combine like terms: 0 + -7 = -7 x = -7 Simplifying x = -7

Subproblem 2

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Solution

x = {-7, -3}

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