(x+4)(x+5)=20

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


Simplifying
(x + 4)(x + 5) = 20

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

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

Multiply (4 + x) * (5 + x)
(4(5 + x) + x(5 + x)) = 20
((5 * 4 + x * 4) + x(5 + x)) = 20
((20 + 4x) + x(5 + x)) = 20
(20 + 4x + (5 * x + x * x)) = 20
(20 + 4x + (5x + x2)) = 20

Combine like terms: 4x + 5x = 9x
(20 + 9x + x2) = 20

Add '-20' to each side of the equation.
20 + 9x + -20 + x2 = 20 + -20

Reorder the terms:
20 + -20 + 9x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
0 + 9x + x2 = 20 + -20
9x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
9x + x2 = 0

Solving
9x + x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(9 + x) = 0

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 '(9 + x)' equal to zero and attempt to solve: Simplifying 9 + x = 0 Solving 9 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x = 0 + -9 x = 0 + -9 Combine like terms: 0 + -9 = -9 x = -9 Simplifying x = -9

Solution

x = {0, -9}

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