4x^2+32x-15=0

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Solution for 4x^2+32x-15=0 equation:


Simplifying
4x2 + 32x + -15 = 0

Reorder the terms:
-15 + 32x + 4x2 = 0

Solving
-15 + 32x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-3.75 + 8x + x2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + 8x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + 8x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + 8x + x2 = 0 + 3.75
8x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
8x + x2 = 3.75

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 3.75 + 16

Reorder the terms:
16 + 8x + x2 = 3.75 + 16

Combine like terms: 3.75 + 16 = 19.75
16 + 8x + x2 = 19.75

Factor a perfect square on the left side:
(x + 4)(x + 4) = 19.75

Calculate the square root of the right side: 4.444097209

Break this problem into two subproblems by setting 
(x + 4) equal to 4.444097209 and -4.444097209.

Subproblem 1

x + 4 = 4.444097209 Simplifying x + 4 = 4.444097209 Reorder the terms: 4 + x = 4.444097209 Solving 4 + x = 4.444097209 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 4.444097209 + -4 Combine like terms: 4 + -4 = 0 0 + x = 4.444097209 + -4 x = 4.444097209 + -4 Combine like terms: 4.444097209 + -4 = 0.444097209 x = 0.444097209 Simplifying x = 0.444097209

Subproblem 2

x + 4 = -4.444097209 Simplifying x + 4 = -4.444097209 Reorder the terms: 4 + x = -4.444097209 Solving 4 + x = -4.444097209 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -4.444097209 + -4 Combine like terms: 4 + -4 = 0 0 + x = -4.444097209 + -4 x = -4.444097209 + -4 Combine like terms: -4.444097209 + -4 = -8.444097209 x = -8.444097209 Simplifying x = -8.444097209

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.444097209, -8.444097209}

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