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

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Solution for (x-9)(4x+7)=0 equation: 


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

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

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

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

Combine like terms: -36x + 7x = -29x
(-63 + -29x + 4x2) = 0

Solving
-63 + -29x + 4x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -4x)(9 + -1x) = 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 + -1x)' equal to zero and attempt to solve:

Simplifying
9 + -1x = 0

Solving
9 + -1x = 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 + -1x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 0 + -9
-1x = 0 + -9

Combine like terms: 0 + -9 = -9
-1x = -9

Divide each side by '-1'.
x = 9

Simplifying
x = 9
Solution
x = {-1.75, 9}

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