7x+(3x-5)(8x+5)=180

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Solution for 7x+(3x-5)(8x+5)=180 equation:


Simplifying
7x + (3x + -5)(8x + 5) = 180

Reorder the terms:
7x + (-5 + 3x)(8x + 5) = 180

Reorder the terms:
7x + (-5 + 3x)(5 + 8x) = 180

Multiply (-5 + 3x) * (5 + 8x)
7x + (-5(5 + 8x) + 3x * (5 + 8x)) = 180
7x + ((5 * -5 + 8x * -5) + 3x * (5 + 8x)) = 180
7x + ((-25 + -40x) + 3x * (5 + 8x)) = 180
7x + (-25 + -40x + (5 * 3x + 8x * 3x)) = 180
7x + (-25 + -40x + (15x + 24x2)) = 180

Combine like terms: -40x + 15x = -25x
7x + (-25 + -25x + 24x2) = 180

Reorder the terms:
-25 + 7x + -25x + 24x2 = 180

Combine like terms: 7x + -25x = -18x
-25 + -18x + 24x2 = 180

Solving
-25 + -18x + 24x2 = 180

Solving for variable 'x'.

Reorder the terms:
-25 + -180 + -18x + 24x2 = 180 + -180

Combine like terms: -25 + -180 = -205
-205 + -18x + 24x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-205 + -18x + 24x2 = 0

Begin completing the square.  Divide all terms by
24 the coefficient of the squared term: 

Divide each side by '24'.
-8.541666667 + -0.75x + x2 = 0

Move the constant term to the right:

Add '8.541666667' to each side of the equation.
-8.541666667 + -0.75x + 8.541666667 + x2 = 0 + 8.541666667

Reorder the terms:
-8.541666667 + 8.541666667 + -0.75x + x2 = 0 + 8.541666667

Combine like terms: -8.541666667 + 8.541666667 = 0.000000000
0.000000000 + -0.75x + x2 = 0 + 8.541666667
-0.75x + x2 = 0 + 8.541666667

Combine like terms: 0 + 8.541666667 = 8.541666667
-0.75x + x2 = 8.541666667

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 8.541666667 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 8.541666667 + 0.140625

Combine like terms: 8.541666667 + 0.140625 = 8.682291667
0.140625 + -0.75x + x2 = 8.682291667

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 8.682291667

Calculate the square root of the right side: 2.946572868

Break this problem into two subproblems by setting 
(x + -0.375) equal to 2.946572868 and -2.946572868.

Subproblem 1

x + -0.375 = 2.946572868 Simplifying x + -0.375 = 2.946572868 Reorder the terms: -0.375 + x = 2.946572868 Solving -0.375 + x = 2.946572868 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 2.946572868 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 2.946572868 + 0.375 x = 2.946572868 + 0.375 Combine like terms: 2.946572868 + 0.375 = 3.321572868 x = 3.321572868 Simplifying x = 3.321572868

Subproblem 2

x + -0.375 = -2.946572868 Simplifying x + -0.375 = -2.946572868 Reorder the terms: -0.375 + x = -2.946572868 Solving -0.375 + x = -2.946572868 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -2.946572868 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -2.946572868 + 0.375 x = -2.946572868 + 0.375 Combine like terms: -2.946572868 + 0.375 = -2.571572868 x = -2.571572868 Simplifying x = -2.571572868

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.321572868, -2.571572868}

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