(5x+4y)(5x+4y)=

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


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

Multiply (5x + 4y) * (5x + 4y)
(5x * (5x + 4y) + 4y * (5x + 4y)) = 0
((5x * 5x + 4y * 5x) + 4y * (5x + 4y)) = 0

Reorder the terms:
((20xy + 25x2) + 4y * (5x + 4y)) = 0
((20xy + 25x2) + 4y * (5x + 4y)) = 0
(20xy + 25x2 + (5x * 4y + 4y * 4y)) = 0
(20xy + 25x2 + (20xy + 16y2)) = 0

Reorder the terms:
(20xy + 20xy + 25x2 + 16y2) = 0

Combine like terms: 20xy + 20xy = 40xy
(40xy + 25x2 + 16y2) = 0

Solving
40xy + 25x2 + 16y2 = 0

Solving for variable 'x'.

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


Subproblem 1
Set the factor '(5x + 4y)' equal to zero and attempt to solve:

Simplifying
5x + 4y = 0

Solving
5x + 4y = 0

Move all terms containing x to the left, all other terms to the right.

Add '-4y' to each side of the equation.
5x + 4y + -4y = 0 + -4y

Combine like terms: 4y + -4y = 0
5x + 0 = 0 + -4y
5x = 0 + -4y
Remove the zero:
5x = -4y

Divide each side by '5'.
x = -0.8y

Simplifying
x = -0.8y

Subproblem 2
Set the factor '(5x + 4y)' equal to zero and attempt to solve:

Simplifying
5x + 4y = 0

Solving
5x + 4y = 0

Move all terms containing x to the left, all other terms to the right.

Add '-4y' to each side of the equation.
5x + 4y + -4y = 0 + -4y

Combine like terms: 4y + -4y = 0
5x + 0 = 0 + -4y
5x = 0 + -4y
Remove the zero:
5x = -4y

Divide each side by '5'.
x = -0.8y

Simplifying
x = -0.8y
Solution
x = {-0.8y, -0.8y}

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