4x^2-29x-90=0

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Solution for 4x^2-29x-90=0 equation:


Simplifying
4x2 + -29x + -90 = 0

Reorder the terms:
-90 + -29x + 4x2 = 0

Solving
-90 + -29x + 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'.
-22.5 + -7.25x + x2 = 0

Move the constant term to the right:

Add '22.5' to each side of the equation.
-22.5 + -7.25x + 22.5 + x2 = 0 + 22.5

Reorder the terms:
-22.5 + 22.5 + -7.25x + x2 = 0 + 22.5

Combine like terms: -22.5 + 22.5 = 0.0
0.0 + -7.25x + x2 = 0 + 22.5
-7.25x + x2 = 0 + 22.5

Combine like terms: 0 + 22.5 = 22.5
-7.25x + x2 = 22.5

The x term is -7.25x.  Take half its coefficient (-3.625).
Square it (13.140625) and add it to both sides.

Add '13.140625' to each side of the equation.
-7.25x + 13.140625 + x2 = 22.5 + 13.140625

Reorder the terms:
13.140625 + -7.25x + x2 = 22.5 + 13.140625

Combine like terms: 22.5 + 13.140625 = 35.640625
13.140625 + -7.25x + x2 = 35.640625

Factor a perfect square on the left side:
(x + -3.625)(x + -3.625) = 35.640625

Calculate the square root of the right side: 5.969976968

Break this problem into two subproblems by setting 
(x + -3.625) equal to 5.969976968 and -5.969976968.

Subproblem 1

x + -3.625 = 5.969976968 Simplifying x + -3.625 = 5.969976968 Reorder the terms: -3.625 + x = 5.969976968 Solving -3.625 + x = 5.969976968 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.625' to each side of the equation. -3.625 + 3.625 + x = 5.969976968 + 3.625 Combine like terms: -3.625 + 3.625 = 0.000 0.000 + x = 5.969976968 + 3.625 x = 5.969976968 + 3.625 Combine like terms: 5.969976968 + 3.625 = 9.594976968 x = 9.594976968 Simplifying x = 9.594976968

Subproblem 2

x + -3.625 = -5.969976968 Simplifying x + -3.625 = -5.969976968 Reorder the terms: -3.625 + x = -5.969976968 Solving -3.625 + x = -5.969976968 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.625' to each side of the equation. -3.625 + 3.625 + x = -5.969976968 + 3.625 Combine like terms: -3.625 + 3.625 = 0.000 0.000 + x = -5.969976968 + 3.625 x = -5.969976968 + 3.625 Combine like terms: -5.969976968 + 3.625 = -2.344976968 x = -2.344976968 Simplifying x = -2.344976968

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.594976968, -2.344976968}

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