(4x+5)(2x+5)=

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Solution for (4x+5)(2x+5)= equation: 


Simplifying
(4x + 5)(2x + 5) = 0

Reorder the terms:
(5 + 4x)(2x + 5) = 0

Reorder the terms:
(5 + 4x)(5 + 2x) = 0

Multiply (5 + 4x) * (5 + 2x)
(5(5 + 2x) + 4x * (5 + 2x)) = 0
((5 * 5 + 2x * 5) + 4x * (5 + 2x)) = 0
((25 + 10x) + 4x * (5 + 2x)) = 0
(25 + 10x + (5 * 4x + 2x * 4x)) = 0
(25 + 10x + (20x + 8x2)) = 0

Combine like terms: 10x + 20x = 30x
(25 + 30x + 8x2) = 0

Solving
25 + 30x + 8x2 = 0

Solving for variable 'x'.

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


Subproblem 1
Set the factor '(5 + 2x)' equal to zero and attempt to solve:

Simplifying
5 + 2x = 0

Solving
5 + 2x = 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 + 2x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 2x = 0 + -5
2x = 0 + -5

Combine like terms: 0 + -5 = -5
2x = -5

Divide each side by '2'.
x = -2.5

Simplifying
x = -2.5

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 = {-2.5, -1.25}

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