(x+1)(x-7)=(2x+3)(x-7)

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Solution for (x+1)(x-7)=(2x+3)(x-7) equation:


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

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

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

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

Combine like terms: 1x + -7x = -6x
(-7 + -6x + x2) = (2x + 3)(x + -7)

Reorder the terms:
-7 + -6x + x2 = (3 + 2x)(x + -7)

Reorder the terms:
-7 + -6x + x2 = (3 + 2x)(-7 + x)

Multiply (3 + 2x) * (-7 + x)
-7 + -6x + x2 = (3(-7 + x) + 2x * (-7 + x))
-7 + -6x + x2 = ((-7 * 3 + x * 3) + 2x * (-7 + x))
-7 + -6x + x2 = ((-21 + 3x) + 2x * (-7 + x))
-7 + -6x + x2 = (-21 + 3x + (-7 * 2x + x * 2x))
-7 + -6x + x2 = (-21 + 3x + (-14x + 2x2))

Combine like terms: 3x + -14x = -11x
-7 + -6x + x2 = (-21 + -11x + 2x2)

Solving
-7 + -6x + x2 = -21 + -11x + 2x2

Solving for variable 'x'.

Reorder the terms:
-7 + 21 + -6x + 11x + x2 + -2x2 = -21 + -11x + 2x2 + 21 + 11x + -2x2

Combine like terms: -7 + 21 = 14
14 + -6x + 11x + x2 + -2x2 = -21 + -11x + 2x2 + 21 + 11x + -2x2

Combine like terms: -6x + 11x = 5x
14 + 5x + x2 + -2x2 = -21 + -11x + 2x2 + 21 + 11x + -2x2

Combine like terms: x2 + -2x2 = -1x2
14 + 5x + -1x2 = -21 + -11x + 2x2 + 21 + 11x + -2x2

Reorder the terms:
14 + 5x + -1x2 = -21 + 21 + -11x + 11x + 2x2 + -2x2

Combine like terms: -21 + 21 = 0
14 + 5x + -1x2 = 0 + -11x + 11x + 2x2 + -2x2
14 + 5x + -1x2 = -11x + 11x + 2x2 + -2x2

Combine like terms: -11x + 11x = 0
14 + 5x + -1x2 = 0 + 2x2 + -2x2
14 + 5x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
14 + 5x + -1x2 = 0

Factor a trinomial.
(7 + -1x)(2 + x) = 0

Subproblem 1

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 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 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Subproblem 2

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Solution

x = {7, -2}

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