-4x^2+15x+2=0

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


Simplifying
-4x2 + 15x + 2 = 0

Reorder the terms:
2 + 15x + -4x2 = 0

Solving
2 + 15x + -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'.
-0.5 + -3.75x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -3.75x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -3.75x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -3.75x + x2 = 0 + 0.5
-3.75x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-3.75x + x2 = 0.5

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = 0.5 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 0.5 + 3.515625

Combine like terms: 0.5 + 3.515625 = 4.015625
3.515625 + -3.75x + x2 = 4.015625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 4.015625

Calculate the square root of the right side: 2.003902443

Break this problem into two subproblems by setting 
(x + -1.875) equal to 2.003902443 and -2.003902443.

Subproblem 1

x + -1.875 = 2.003902443 Simplifying x + -1.875 = 2.003902443 Reorder the terms: -1.875 + x = 2.003902443 Solving -1.875 + x = 2.003902443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 2.003902443 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.003902443 + 1.875 x = 2.003902443 + 1.875 Combine like terms: 2.003902443 + 1.875 = 3.878902443 x = 3.878902443 Simplifying x = 3.878902443

Subproblem 2

x + -1.875 = -2.003902443 Simplifying x + -1.875 = -2.003902443 Reorder the terms: -1.875 + x = -2.003902443 Solving -1.875 + x = -2.003902443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -2.003902443 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.003902443 + 1.875 x = -2.003902443 + 1.875 Combine like terms: -2.003902443 + 1.875 = -0.128902443 x = -0.128902443 Simplifying x = -0.128902443

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.878902443, -0.128902443}

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