4x^2+x-15=180

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Solution for 4x^2+x-15=180 equation:


Simplifying
4x2 + x + -15 = 180

Reorder the terms:
-15 + x + 4x2 = 180

Solving
-15 + x + 4x2 = 180

Solving for variable 'x'.

Reorder the terms:
-15 + -180 + x + 4x2 = 180 + -180

Combine like terms: -15 + -180 = -195
-195 + x + 4x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-195 + x + 4x2 = 0

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

Divide each side by '4'.
-48.75 + 0.25x + x2 = 0

Move the constant term to the right:

Add '48.75' to each side of the equation.
-48.75 + 0.25x + 48.75 + x2 = 0 + 48.75

Reorder the terms:
-48.75 + 48.75 + 0.25x + x2 = 0 + 48.75

Combine like terms: -48.75 + 48.75 = 0.00
0.00 + 0.25x + x2 = 0 + 48.75
0.25x + x2 = 0 + 48.75

Combine like terms: 0 + 48.75 = 48.75
0.25x + x2 = 48.75

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.25x + 0.25 + x2 = 48.75 + 0.25

Reorder the terms:
0.25 + 0.25x + x2 = 48.75 + 0.25

Combine like terms: 48.75 + 0.25 = 49
0.25 + 0.25x + x2 = 49

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + 0.5) equal to 7 and -7.

Subproblem 1

x + 0.5 = 7 Simplifying x + 0.5 = 7 Reorder the terms: 0.5 + x = 7 Solving 0.5 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 7 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 7 + -0.5 x = 7 + -0.5 Combine like terms: 7 + -0.5 = 6.5 x = 6.5 Simplifying x = 6.5

Subproblem 2

x + 0.5 = -7 Simplifying x + 0.5 = -7 Reorder the terms: 0.5 + x = -7 Solving 0.5 + x = -7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -7 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -7 + -0.5 x = -7 + -0.5 Combine like terms: -7 + -0.5 = -7.5 x = -7.5 Simplifying x = -7.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.5, -7.5}

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