3(2x-5)(4x+31)=0

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Solution for 3(2x-5)(4x+31)=0 equation: 


Simplifying
3(2x + -5)(4x + 31) = 0

Reorder the terms:
3(-5 + 2x)(4x + 31) = 0

Reorder the terms:
3(-5 + 2x)(31 + 4x) = 0

Multiply (-5 + 2x) * (31 + 4x)
3(-5(31 + 4x) + 2x * (31 + 4x)) = 0
3((31 * -5 + 4x * -5) + 2x * (31 + 4x)) = 0
3((-155 + -20x) + 2x * (31 + 4x)) = 0
3(-155 + -20x + (31 * 2x + 4x * 2x)) = 0
3(-155 + -20x + (62x + 8x2)) = 0

Combine like terms: -20x + 62x = 42x
3(-155 + 42x + 8x2) = 0
(-155 * 3 + 42x * 3 + 8x2 * 3) = 0
(-465 + 126x + 24x2) = 0

Solving
-465 + 126x + 24x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-155 + 42x + 8x2) = 0

Factor a trinomial.
3((-31 + -4x)(5 + -2x)) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-31 + -4x)' equal to zero and attempt to solve:

Simplifying
-31 + -4x = 0

Solving
-31 + -4x = 0

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

Add '31' to each side of the equation.
-31 + 31 + -4x = 0 + 31

Combine like terms: -31 + 31 = 0
0 + -4x = 0 + 31
-4x = 0 + 31

Combine like terms: 0 + 31 = 31
-4x = 31

Divide each side by '-4'.
x = -7.75

Simplifying
x = -7.75

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

Simplifying
5 + -2x = 0

Solving
5 + -2x = 0

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

Add '-5' to each side of the equation.
5 + -5 + -2x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -2x = 0 + -5
-2x = 0 + -5

Combine like terms: 0 + -5 = -5
-2x = -5

Divide each side by '-2'.
x = 2.5

Simplifying
x = 2.5
Solution
x = {-7.75, 2.5}

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