-16x^2+135x+76=0

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Solution for -16x^2+135x+76=0 equation:


Simplifying
-16x2 + 135x + 76 = 0

Reorder the terms:
76 + 135x + -16x2 = 0

Solving
76 + 135x + -16x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-4.75 + -8.4375x + x2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + -8.4375x + 4.75 + x2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + -8.4375x + x2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + -8.4375x + x2 = 0 + 4.75
-8.4375x + x2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
-8.4375x + x2 = 4.75

The x term is -8.4375x.  Take half its coefficient (-4.21875).
Square it (17.79785156) and add it to both sides.

Add '17.79785156' to each side of the equation.
-8.4375x + 17.79785156 + x2 = 4.75 + 17.79785156

Reorder the terms:
17.79785156 + -8.4375x + x2 = 4.75 + 17.79785156

Combine like terms: 4.75 + 17.79785156 = 22.54785156
17.79785156 + -8.4375x + x2 = 22.54785156

Factor a perfect square on the left side:
(x + -4.21875)(x + -4.21875) = 22.54785156

Calculate the square root of the right side: 4.748457809

Break this problem into two subproblems by setting 
(x + -4.21875) equal to 4.748457809 and -4.748457809.

Subproblem 1

x + -4.21875 = 4.748457809 Simplifying x + -4.21875 = 4.748457809 Reorder the terms: -4.21875 + x = 4.748457809 Solving -4.21875 + x = 4.748457809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.21875' to each side of the equation. -4.21875 + 4.21875 + x = 4.748457809 + 4.21875 Combine like terms: -4.21875 + 4.21875 = 0.00000 0.00000 + x = 4.748457809 + 4.21875 x = 4.748457809 + 4.21875 Combine like terms: 4.748457809 + 4.21875 = 8.967207809 x = 8.967207809 Simplifying x = 8.967207809

Subproblem 2

x + -4.21875 = -4.748457809 Simplifying x + -4.21875 = -4.748457809 Reorder the terms: -4.21875 + x = -4.748457809 Solving -4.21875 + x = -4.748457809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.21875' to each side of the equation. -4.21875 + 4.21875 + x = -4.748457809 + 4.21875 Combine like terms: -4.21875 + 4.21875 = 0.00000 0.00000 + x = -4.748457809 + 4.21875 x = -4.748457809 + 4.21875 Combine like terms: -4.748457809 + 4.21875 = -0.529707809 x = -0.529707809 Simplifying x = -0.529707809

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.967207809, -0.529707809}

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