(9x-7y)(9x+7y)=

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Solution for (9x-7y)(9x+7y)= equation: 


Simplifying
(9x + -7y)(9x + 7y) = 0

Multiply (9x + -7y) * (9x + 7y)
(9x * (9x + 7y) + -7y * (9x + 7y)) = 0
((9x * 9x + 7y * 9x) + -7y * (9x + 7y)) = 0

Reorder the terms:
((63xy + 81x2) + -7y * (9x + 7y)) = 0
((63xy + 81x2) + -7y * (9x + 7y)) = 0
(63xy + 81x2 + (9x * -7y + 7y * -7y)) = 0
(63xy + 81x2 + (-63xy + -49y2)) = 0

Reorder the terms:
(63xy + -63xy + 81x2 + -49y2) = 0

Combine like terms: 63xy + -63xy = 0
(0 + 81x2 + -49y2) = 0
(81x2 + -49y2) = 0

Solving
81x2 + -49y2 = 0

Solving for variable 'x'.

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

Add '49y2' to each side of the equation.
81x2 + -49y2 + 49y2 = 0 + 49y2

Combine like terms: -49y2 + 49y2 = 0
81x2 + 0 = 0 + 49y2
81x2 = 0 + 49y2
Remove the zero:
81x2 = 49y2

Divide each side by '81'.
x2 = 0.6049382716y2

Simplifying
x2 = 0.6049382716y2

Take the square root of each side:
x = {-0.777777778y, 0.777777778y}

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