4*x*(x+3)-(2*x+5)*(2*x-5)=49

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Solution for 4*x*(x+3)-(2*x+5)*(2*x-5)=49 equation:


Simplifying
4x(x + 3) + -1(2x + 5)(2x + -5) = 49

Reorder the terms:
4x(3 + x) + -1(2x + 5)(2x + -5) = 49
(3 * 4x + x * 4x) + -1(2x + 5)(2x + -5) = 49
(12x + 4x2) + -1(2x + 5)(2x + -5) = 49

Reorder the terms:
12x + 4x2 + -1(5 + 2x)(2x + -5) = 49

Reorder the terms:
12x + 4x2 + -1(5 + 2x)(-5 + 2x) = 49

Multiply (5 + 2x) * (-5 + 2x)
12x + 4x2 + -1(5(-5 + 2x) + 2x * (-5 + 2x)) = 49
12x + 4x2 + -1((-5 * 5 + 2x * 5) + 2x * (-5 + 2x)) = 49
12x + 4x2 + -1((-25 + 10x) + 2x * (-5 + 2x)) = 49
12x + 4x2 + -1(-25 + 10x + (-5 * 2x + 2x * 2x)) = 49
12x + 4x2 + -1(-25 + 10x + (-10x + 4x2)) = 49

Combine like terms: 10x + -10x = 0
12x + 4x2 + -1(-25 + 0 + 4x2) = 49
12x + 4x2 + -1(-25 + 4x2) = 49
12x + 4x2 + (-25 * -1 + 4x2 * -1) = 49
12x + 4x2 + (25 + -4x2) = 49

Reorder the terms:
25 + 12x + 4x2 + -4x2 = 49

Combine like terms: 4x2 + -4x2 = 0
25 + 12x + 0 = 49
25 + 12x = 49

Solving
25 + 12x = 49

Solving for variable 'x'.

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

Add '-25' to each side of the equation.
25 + -25 + 12x = 49 + -25

Combine like terms: 25 + -25 = 0
0 + 12x = 49 + -25
12x = 49 + -25

Combine like terms: 49 + -25 = 24
12x = 24

Divide each side by '12'.
x = 2

Simplifying
x = 2

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