x^2-25+3(x-5)(2x+7)=0

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Solution for x^2-25+3(x-5)(2x+7)=0 equation: 


Simplifying
x2 + -25 + 3(x + -5)(2x + 7) = 0

Reorder the terms:
x2 + -25 + 3(-5 + x)(2x + 7) = 0

Reorder the terms:
x2 + -25 + 3(-5 + x)(7 + 2x) = 0

Multiply (-5 + x) * (7 + 2x)
x2 + -25 + 3(-5(7 + 2x) + x(7 + 2x)) = 0
x2 + -25 + 3((7 * -5 + 2x * -5) + x(7 + 2x)) = 0
x2 + -25 + 3((-35 + -10x) + x(7 + 2x)) = 0
x2 + -25 + 3(-35 + -10x + (7 * x + 2x * x)) = 0
x2 + -25 + 3(-35 + -10x + (7x + 2x2)) = 0

Combine like terms: -10x + 7x = -3x
x2 + -25 + 3(-35 + -3x + 2x2) = 0
x2 + -25 + (-35 * 3 + -3x * 3 + 2x2 * 3) = 0
x2 + -25 + (-105 + -9x + 6x2) = 0

Reorder the terms:
-25 + -105 + -9x + x2 + 6x2 = 0

Combine like terms: -25 + -105 = -130
-130 + -9x + x2 + 6x2 = 0

Combine like terms: x2 + 6x2 = 7x2
-130 + -9x + 7x2 = 0

Solving
-130 + -9x + 7x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-26 + -7x)(5 + -1x) = 0


Subproblem 1
Set the factor '(-26 + -7x)' equal to zero and attempt to solve:

Simplifying
-26 + -7x = 0

Solving
-26 + -7x = 0

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

Add '26' to each side of the equation.
-26 + 26 + -7x = 0 + 26

Combine like terms: -26 + 26 = 0
0 + -7x = 0 + 26
-7x = 0 + 26

Combine like terms: 0 + 26 = 26
-7x = 26

Divide each side by '-7'.
x = -3.714285714

Simplifying
x = -3.714285714

Subproblem 2
Set the factor '(5 + -1x)' equal to zero and attempt to solve:

Simplifying
5 + -1x = 0

Solving
5 + -1x = 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 + -1x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1x = 0 + -5
-1x = 0 + -5

Combine like terms: 0 + -5 = -5
-1x = -5

Divide each side by '-1'.
x = 5

Simplifying
x = 5
Solution
x = {-3.714285714, 5}

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