-4(x^2)+15x-8=0

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Solution for -4(x^2)+15x-8=0 equation:


Simplifying
-4(x2) + 15x + -8 = 0

Reorder the terms:
-8 + 15x + -4x2 = 0

Solving
-8 + 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'.
2 + -3.75x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -3.75x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + -3.75x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3.75x + x2 = 0 + -2
-3.75x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3.75x + x2 = -2

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 = -2 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = -2 + 3.515625

Combine like terms: -2 + 3.515625 = 1.515625
3.515625 + -3.75x + x2 = 1.515625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(x + -1.875) equal to 1.231107225 and -1.231107225.

Subproblem 1

x + -1.875 = 1.231107225 Simplifying x + -1.875 = 1.231107225 Reorder the terms: -1.875 + x = 1.231107225 Solving -1.875 + x = 1.231107225 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 = 1.231107225 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 1.231107225 + 1.875 x = 1.231107225 + 1.875 Combine like terms: 1.231107225 + 1.875 = 3.106107225 x = 3.106107225 Simplifying x = 3.106107225

Subproblem 2

x + -1.875 = -1.231107225 Simplifying x + -1.875 = -1.231107225 Reorder the terms: -1.875 + x = -1.231107225 Solving -1.875 + x = -1.231107225 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 = -1.231107225 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -1.231107225 + 1.875 x = -1.231107225 + 1.875 Combine like terms: -1.231107225 + 1.875 = 0.643892775 x = 0.643892775 Simplifying x = 0.643892775

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.106107225, 0.643892775}

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