(4x-5)(5x+7)=(4x-5)(4x+5)

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Solution for (4x-5)(5x+7)=(4x-5)(4x+5) equation:


Simplifying
(4x + -5)(5x + 7) = (4x + -5)(4x + 5)

Reorder the terms:
(-5 + 4x)(5x + 7) = (4x + -5)(4x + 5)

Reorder the terms:
(-5 + 4x)(7 + 5x) = (4x + -5)(4x + 5)

Multiply (-5 + 4x) * (7 + 5x)
(-5(7 + 5x) + 4x * (7 + 5x)) = (4x + -5)(4x + 5)
((7 * -5 + 5x * -5) + 4x * (7 + 5x)) = (4x + -5)(4x + 5)
((-35 + -25x) + 4x * (7 + 5x)) = (4x + -5)(4x + 5)
(-35 + -25x + (7 * 4x + 5x * 4x)) = (4x + -5)(4x + 5)
(-35 + -25x + (28x + 20x2)) = (4x + -5)(4x + 5)

Combine like terms: -25x + 28x = 3x
(-35 + 3x + 20x2) = (4x + -5)(4x + 5)

Reorder the terms:
-35 + 3x + 20x2 = (-5 + 4x)(4x + 5)

Reorder the terms:
-35 + 3x + 20x2 = (-5 + 4x)(5 + 4x)

Multiply (-5 + 4x) * (5 + 4x)
-35 + 3x + 20x2 = (-5(5 + 4x) + 4x * (5 + 4x))
-35 + 3x + 20x2 = ((5 * -5 + 4x * -5) + 4x * (5 + 4x))
-35 + 3x + 20x2 = ((-25 + -20x) + 4x * (5 + 4x))
-35 + 3x + 20x2 = (-25 + -20x + (5 * 4x + 4x * 4x))
-35 + 3x + 20x2 = (-25 + -20x + (20x + 16x2))

Combine like terms: -20x + 20x = 0
-35 + 3x + 20x2 = (-25 + 0 + 16x2)
-35 + 3x + 20x2 = (-25 + 16x2)

Solving
-35 + 3x + 20x2 = -25 + 16x2

Solving for variable 'x'.

Reorder the terms:
-35 + 25 + 3x + 20x2 + -16x2 = -25 + 16x2 + 25 + -16x2

Combine like terms: -35 + 25 = -10
-10 + 3x + 20x2 + -16x2 = -25 + 16x2 + 25 + -16x2

Combine like terms: 20x2 + -16x2 = 4x2
-10 + 3x + 4x2 = -25 + 16x2 + 25 + -16x2

Reorder the terms:
-10 + 3x + 4x2 = -25 + 25 + 16x2 + -16x2

Combine like terms: -25 + 25 = 0
-10 + 3x + 4x2 = 0 + 16x2 + -16x2
-10 + 3x + 4x2 = 16x2 + -16x2

Combine like terms: 16x2 + -16x2 = 0
-10 + 3x + 4x2 = 0

Factor a trinomial.
(-2 + -1x)(5 + -4x) = 0

Subproblem 1

Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 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 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2

Subproblem 2

Set the factor '(5 + -4x)' equal to zero and attempt to solve: Simplifying 5 + -4x = 0 Solving 5 + -4x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -4x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4x = 0 + -5 -4x = 0 + -5 Combine like terms: 0 + -5 = -5 -4x = -5 Divide each side by '-4'. x = 1.25 Simplifying x = 1.25

Solution

x = {-2, 1.25}

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