(4x-1)(x+9)=0

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Solution for (4x-1)(x+9)=0 equation:


Simplifying
(4x + -1)(x + 9) = 0

Reorder the terms:
(-1 + 4x)(x + 9) = 0

Reorder the terms:
(-1 + 4x)(9 + x) = 0

Multiply (-1 + 4x) * (9 + x)
(-1(9 + x) + 4x * (9 + x)) = 0
((9 * -1 + x * -1) + 4x * (9 + x)) = 0
((-9 + -1x) + 4x * (9 + x)) = 0
(-9 + -1x + (9 * 4x + x * 4x)) = 0
(-9 + -1x + (36x + 4x2)) = 0

Combine like terms: -1x + 36x = 35x
(-9 + 35x + 4x2) = 0

Solving
-9 + 35x + 4x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -1x)(1 + -4x) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(1 + -4x)' equal to zero and attempt to solve: Simplifying 1 + -4x = 0 Solving 1 + -4x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -4x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -4x = 0 + -1 -4x = 0 + -1 Combine like terms: 0 + -1 = -1 -4x = -1 Divide each side by '-4'. x = 0.25 Simplifying x = 0.25

Solution

x = {-9, 0.25}

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