X*X+2*X-8=7

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Solution for X*X+2*X-8=7 equation:


Simplifying
X * X + 2X + -8 = 7

Multiply X * X
X2 + 2X + -8 = 7

Reorder the terms:
-8 + 2X + X2 = 7

Solving
-8 + 2X + X2 = 7

Solving for variable 'X'.

Reorder the terms:
-8 + -7 + 2X + X2 = 7 + -7

Combine like terms: -8 + -7 = -15
-15 + 2X + X2 = 7 + -7

Combine like terms: 7 + -7 = 0
-15 + 2X + X2 = 0

Factor a trinomial.
(-5 + -1X)(3 + -1X) = 0

Subproblem 1

Set the factor '(-5 + -1X)' equal to zero and attempt to solve: Simplifying -5 + -1X = 0 Solving -5 + -1X = 0 Move all terms containing X to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1X = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1X = 0 + 5 -1X = 0 + 5 Combine like terms: 0 + 5 = 5 -1X = 5 Divide each side by '-1'. X = -5 Simplifying X = -5

Subproblem 2

Set the factor '(3 + -1X)' equal to zero and attempt to solve: Simplifying 3 + -1X = 0 Solving 3 + -1X = 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 + -1X = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1X = 0 + -3 -1X = 0 + -3 Combine like terms: 0 + -3 = -3 -1X = -3 Divide each side by '-1'. X = 3 Simplifying X = 3

Solution

X = {-5, 3}

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