-2x(x-4)=7(x-4)

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


Simplifying
-2x(x + -4) = 7(x + -4)

Reorder the terms:
-2x(-4 + x) = 7(x + -4)
(-4 * -2x + x * -2x) = 7(x + -4)
(8x + -2x2) = 7(x + -4)

Reorder the terms:
8x + -2x2 = 7(-4 + x)
8x + -2x2 = (-4 * 7 + x * 7)
8x + -2x2 = (-28 + 7x)

Solving
8x + -2x2 = -28 + 7x

Solving for variable 'x'.

Reorder the terms:
28 + 8x + -7x + -2x2 = -28 + 7x + 28 + -7x

Combine like terms: 8x + -7x = 1x
28 + 1x + -2x2 = -28 + 7x + 28 + -7x

Reorder the terms:
28 + 1x + -2x2 = -28 + 28 + 7x + -7x

Combine like terms: -28 + 28 = 0
28 + 1x + -2x2 = 0 + 7x + -7x
28 + 1x + -2x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
28 + 1x + -2x2 = 0

Factor a trinomial.
(4 + -1x)(7 + 2x) = 0


Subproblem 1
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 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 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4

Subproblem 2
Set the factor '(7 + 2x)' equal to zero and attempt to solve:

Simplifying
7 + 2x = 0

Solving
7 + 2x = 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 + 2x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 2x = 0 + -7
2x = 0 + -7

Combine like terms: 0 + -7 = -7
2x = -7

Divide each side by '2'.
x = -3.5

Simplifying
x = -3.5
Solution
x = {4, -3.5}

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