2(x+7)(x-3)=x(x+7)+90

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Solution for 2(x+7)(x-3)=x(x+7)+90 equation:


Simplifying
2(x + 7)(x + -3) = x(x + 7) + 90

Reorder the terms:
2(7 + x)(x + -3) = x(x + 7) + 90

Reorder the terms:
2(7 + x)(-3 + x) = x(x + 7) + 90

Multiply (7 + x) * (-3 + x)
2(7(-3 + x) + x(-3 + x)) = x(x + 7) + 90
2((-3 * 7 + x * 7) + x(-3 + x)) = x(x + 7) + 90
2((-21 + 7x) + x(-3 + x)) = x(x + 7) + 90
2(-21 + 7x + (-3 * x + x * x)) = x(x + 7) + 90
2(-21 + 7x + (-3x + x2)) = x(x + 7) + 90

Combine like terms: 7x + -3x = 4x
2(-21 + 4x + x2) = x(x + 7) + 90
(-21 * 2 + 4x * 2 + x2 * 2) = x(x + 7) + 90
(-42 + 8x + 2x2) = x(x + 7) + 90

Reorder the terms:
-42 + 8x + 2x2 = x(7 + x) + 90
-42 + 8x + 2x2 = (7 * x + x * x) + 90
-42 + 8x + 2x2 = (7x + x2) + 90

Reorder the terms:
-42 + 8x + 2x2 = 90 + 7x + x2

Solving
-42 + 8x + 2x2 = 90 + 7x + x2

Solving for variable 'x'.

Reorder the terms:
-42 + -90 + 8x + -7x + 2x2 + -1x2 = 90 + 7x + x2 + -90 + -7x + -1x2

Combine like terms: -42 + -90 = -132
-132 + 8x + -7x + 2x2 + -1x2 = 90 + 7x + x2 + -90 + -7x + -1x2

Combine like terms: 8x + -7x = 1x
-132 + 1x + 2x2 + -1x2 = 90 + 7x + x2 + -90 + -7x + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
-132 + 1x + 1x2 = 90 + 7x + x2 + -90 + -7x + -1x2

Reorder the terms:
-132 + 1x + 1x2 = 90 + -90 + 7x + -7x + x2 + -1x2

Combine like terms: 90 + -90 = 0
-132 + 1x + 1x2 = 0 + 7x + -7x + x2 + -1x2
-132 + 1x + 1x2 = 7x + -7x + x2 + -1x2

Combine like terms: 7x + -7x = 0
-132 + 1x + 1x2 = 0 + x2 + -1x2
-132 + 1x + 1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-132 + 1x + 1x2 = 0

Factor a trinomial.
(-12 + -1x)(11 + -1x) = 0

Subproblem 1

Set the factor '(-12 + -1x)' equal to zero and attempt to solve: Simplifying -12 + -1x = 0 Solving -12 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1x = 0 + 12 -1x = 0 + 12 Combine like terms: 0 + 12 = 12 -1x = 12 Divide each side by '-1'. x = -12 Simplifying x = -12

Subproblem 2

Set the factor '(11 + -1x)' equal to zero and attempt to solve: Simplifying 11 + -1x = 0 Solving 11 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -1x = 0 + -11 Combine like terms: 11 + -11 = 0 0 + -1x = 0 + -11 -1x = 0 + -11 Combine like terms: 0 + -11 = -11 -1x = -11 Divide each side by '-1'. x = 11 Simplifying x = 11

Solution

x = {-12, 11}

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