4(x-15)(x+15)=20(x+15)+16(5)(x-15)

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Solution for 4(x-15)(x+15)=20(x+15)+16(5)(x-15) equation:


Simplifying
4(x + -15)(x + 15) = 20(x + 15) + 16(5)(x + -15)

Reorder the terms:
4(-15 + x)(x + 15) = 20(x + 15) + 16(5)(x + -15)

Reorder the terms:
4(-15 + x)(15 + x) = 20(x + 15) + 16(5)(x + -15)

Multiply (-15 + x) * (15 + x)
4(-15(15 + x) + x(15 + x)) = 20(x + 15) + 16(5)(x + -15)
4((15 * -15 + x * -15) + x(15 + x)) = 20(x + 15) + 16(5)(x + -15)
4((-225 + -15x) + x(15 + x)) = 20(x + 15) + 16(5)(x + -15)
4(-225 + -15x + (15 * x + x * x)) = 20(x + 15) + 16(5)(x + -15)
4(-225 + -15x + (15x + x2)) = 20(x + 15) + 16(5)(x + -15)

Combine like terms: -15x + 15x = 0
4(-225 + 0 + x2) = 20(x + 15) + 16(5)(x + -15)
4(-225 + x2) = 20(x + 15) + 16(5)(x + -15)
(-225 * 4 + x2 * 4) = 20(x + 15) + 16(5)(x + -15)
(-900 + 4x2) = 20(x + 15) + 16(5)(x + -15)

Reorder the terms:
-900 + 4x2 = 20(15 + x) + 16(5)(x + -15)
-900 + 4x2 = (15 * 20 + x * 20) + 16(5)(x + -15)
-900 + 4x2 = (300 + 20x) + 16(5)(x + -15)

Reorder the terms:
-900 + 4x2 = 300 + 20x + 16 * 5(-15 + x)

Multiply 16 * 5
-900 + 4x2 = 300 + 20x + 80(-15 + x)
-900 + 4x2 = 300 + 20x + (-15 * 80 + x * 80)
-900 + 4x2 = 300 + 20x + (-1200 + 80x)

Reorder the terms:
-900 + 4x2 = 300 + -1200 + 20x + 80x

Combine like terms: 300 + -1200 = -900
-900 + 4x2 = -900 + 20x + 80x

Combine like terms: 20x + 80x = 100x
-900 + 4x2 = -900 + 100x

Add '900' to each side of the equation.
-900 + 900 + 4x2 = -900 + 900 + 100x

Combine like terms: -900 + 900 = 0
0 + 4x2 = -900 + 900 + 100x
4x2 = -900 + 900 + 100x

Combine like terms: -900 + 900 = 0
4x2 = 0 + 100x
4x2 = 100x

Solving
4x2 = 100x

Solving for variable 'x'.

Reorder the terms:
-100x + 4x2 = 100x + -100x

Combine like terms: 100x + -100x = 0
-100x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4x'.
4x(-25 + x) = 0

Ignore the factor 4.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(-25 + x)' equal to zero and attempt to solve: Simplifying -25 + x = 0 Solving -25 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + x = 0 + 25 Combine like terms: -25 + 25 = 0 0 + x = 0 + 25 x = 0 + 25 Combine like terms: 0 + 25 = 25 x = 25 Simplifying x = 25

Solution

x = {0, 25}

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