(x-4)(x+7)-(2x+3)(x+7)=0

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Solution for (x-4)(x+7)-(2x+3)(x+7)=0 equation:


Simplifying
(x + -4)(x + 7) + -1(2x + 3)(x + 7) = 0

Reorder the terms:
(-4 + x)(x + 7) + -1(2x + 3)(x + 7) = 0

Reorder the terms:
(-4 + x)(7 + x) + -1(2x + 3)(x + 7) = 0

Multiply (-4 + x) * (7 + x)
(-4(7 + x) + x(7 + x)) + -1(2x + 3)(x + 7) = 0
((7 * -4 + x * -4) + x(7 + x)) + -1(2x + 3)(x + 7) = 0
((-28 + -4x) + x(7 + x)) + -1(2x + 3)(x + 7) = 0
(-28 + -4x + (7 * x + x * x)) + -1(2x + 3)(x + 7) = 0
(-28 + -4x + (7x + x2)) + -1(2x + 3)(x + 7) = 0

Combine like terms: -4x + 7x = 3x
(-28 + 3x + x2) + -1(2x + 3)(x + 7) = 0

Reorder the terms:
-28 + 3x + x2 + -1(3 + 2x)(x + 7) = 0

Reorder the terms:
-28 + 3x + x2 + -1(3 + 2x)(7 + x) = 0

Multiply (3 + 2x) * (7 + x)
-28 + 3x + x2 + -1(3(7 + x) + 2x * (7 + x)) = 0
-28 + 3x + x2 + -1((7 * 3 + x * 3) + 2x * (7 + x)) = 0
-28 + 3x + x2 + -1((21 + 3x) + 2x * (7 + x)) = 0
-28 + 3x + x2 + -1(21 + 3x + (7 * 2x + x * 2x)) = 0
-28 + 3x + x2 + -1(21 + 3x + (14x + 2x2)) = 0

Combine like terms: 3x + 14x = 17x
-28 + 3x + x2 + -1(21 + 17x + 2x2) = 0
-28 + 3x + x2 + (21 * -1 + 17x * -1 + 2x2 * -1) = 0
-28 + 3x + x2 + (-21 + -17x + -2x2) = 0

Reorder the terms:
-28 + -21 + 3x + -17x + x2 + -2x2 = 0

Combine like terms: -28 + -21 = -49
-49 + 3x + -17x + x2 + -2x2 = 0

Combine like terms: 3x + -17x = -14x
-49 + -14x + x2 + -2x2 = 0

Combine like terms: x2 + -2x2 = -1x2
-49 + -14x + -1x2 = 0

Solving
-49 + -14x + -1x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(49 + 14x + x2) = 0

Factor a trinomial.
-1((7 + x)(7 + 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 '(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

Solution

x = {-7, -7}

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