(2x-4)(7x+5)=0

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Solution for (2x-4)(7x+5)=0 equation: 


Simplifying
(2x + -4)(7x + 5) = 0

Reorder the terms:
(-4 + 2x)(7x + 5) = 0

Reorder the terms:
(-4 + 2x)(5 + 7x) = 0

Multiply (-4 + 2x) * (5 + 7x)
(-4(5 + 7x) + 2x * (5 + 7x)) = 0
((5 * -4 + 7x * -4) + 2x * (5 + 7x)) = 0
((-20 + -28x) + 2x * (5 + 7x)) = 0
(-20 + -28x + (5 * 2x + 7x * 2x)) = 0
(-20 + -28x + (10x + 14x2)) = 0

Combine like terms: -28x + 10x = -18x
(-20 + -18x + 14x2) = 0

Solving
-20 + -18x + 14x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-10 + -9x + 7x2) = 0

Factor a trinomial.
2((-5 + -7x)(2 + -1x)) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-5 + -7x)' equal to zero and attempt to solve:

Simplifying
-5 + -7x = 0

Solving
-5 + -7x = 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 + -7x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -7x = 0 + 5
-7x = 0 + 5

Combine like terms: 0 + 5 = 5
-7x = 5

Divide each side by '-7'.
x = -0.7142857143

Simplifying
x = -0.7142857143

Subproblem 2
Set the factor '(2 + -1x)' equal to zero and attempt to solve:

Simplifying
2 + -1x = 0

Solving
2 + -1x = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1x = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1x = 0 + -2
-1x = 0 + -2

Combine like terms: 0 + -2 = -2
-1x = -2

Divide each side by '-1'.
x = 2

Simplifying
x = 2
Solution
x = {-0.7142857143, 2}

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