(4x+7)(4x-9)=

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Solution for (4x+7)(4x-9)= equation: 


Simplifying
(4x + 7)(4x + -9) = 0

Reorder the terms:
(7 + 4x)(4x + -9) = 0

Reorder the terms:
(7 + 4x)(-9 + 4x) = 0

Multiply (7 + 4x) * (-9 + 4x)
(7(-9 + 4x) + 4x * (-9 + 4x)) = 0
((-9 * 7 + 4x * 7) + 4x * (-9 + 4x)) = 0
((-63 + 28x) + 4x * (-9 + 4x)) = 0
(-63 + 28x + (-9 * 4x + 4x * 4x)) = 0
(-63 + 28x + (-36x + 16x2)) = 0

Combine like terms: 28x + -36x = -8x
(-63 + -8x + 16x2) = 0

Solving
-63 + -8x + 16x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -4x)(9 + -4x) = 0


Subproblem 1
Set the factor '(-7 + -4x)' equal to zero and attempt to solve:

Simplifying
-7 + -4x = 0

Solving
-7 + -4x = 0

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

Add '7' to each side of the equation.
-7 + 7 + -4x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -4x = 0 + 7
-4x = 0 + 7

Combine like terms: 0 + 7 = 7
-4x = 7

Divide each side by '-4'.
x = -1.75

Simplifying
x = -1.75

Subproblem 2
Set the factor '(9 + -4x)' equal to zero and attempt to solve:

Simplifying
9 + -4x = 0

Solving
9 + -4x = 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 + -4x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -4x = 0 + -9
-4x = 0 + -9

Combine like terms: 0 + -9 = -9
-4x = -9

Divide each side by '-4'.
x = 2.25

Simplifying
x = 2.25
Solution
x = {-1.75, 2.25}

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