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

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


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

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

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

Multiply (3 + x) * (-3 + x)
(3(-3 + x) + x(-3 + x)) = (2x + 7)(x + -3)
((-3 * 3 + x * 3) + x(-3 + x)) = (2x + 7)(x + -3)
((-9 + 3x) + x(-3 + x)) = (2x + 7)(x + -3)
(-9 + 3x + (-3 * x + x * x)) = (2x + 7)(x + -3)
(-9 + 3x + (-3x + x2)) = (2x + 7)(x + -3)

Combine like terms: 3x + -3x = 0
(-9 + 0 + x2) = (2x + 7)(x + -3)
(-9 + x2) = (2x + 7)(x + -3)

Reorder the terms:
-9 + x2 = (7 + 2x)(x + -3)

Reorder the terms:
-9 + x2 = (7 + 2x)(-3 + x)

Multiply (7 + 2x) * (-3 + x)
-9 + x2 = (7(-3 + x) + 2x * (-3 + x))
-9 + x2 = ((-3 * 7 + x * 7) + 2x * (-3 + x))
-9 + x2 = ((-21 + 7x) + 2x * (-3 + x))
-9 + x2 = (-21 + 7x + (-3 * 2x + x * 2x))
-9 + x2 = (-21 + 7x + (-6x + 2x2))

Combine like terms: 7x + -6x = 1x
-9 + x2 = (-21 + 1x + 2x2)

Solving
-9 + x2 = -21 + 1x + 2x2

Solving for variable 'x'.

Reorder the terms:
-9 + 21 + -1x + x2 + -2x2 = -21 + 1x + 2x2 + 21 + -1x + -2x2

Combine like terms: -9 + 21 = 12
12 + -1x + x2 + -2x2 = -21 + 1x + 2x2 + 21 + -1x + -2x2

Combine like terms: x2 + -2x2 = -1x2
12 + -1x + -1x2 = -21 + 1x + 2x2 + 21 + -1x + -2x2

Reorder the terms:
12 + -1x + -1x2 = -21 + 21 + 1x + -1x + 2x2 + -2x2

Combine like terms: -21 + 21 = 0
12 + -1x + -1x2 = 0 + 1x + -1x + 2x2 + -2x2
12 + -1x + -1x2 = 1x + -1x + 2x2 + -2x2

Combine like terms: 1x + -1x = 0
12 + -1x + -1x2 = 0 + 2x2 + -2x2
12 + -1x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
12 + -1x + -1x2 = 0

Factor a trinomial.
(3 + -1x)(4 + x) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(4 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4

Solution

x = {3, -4}

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