-8x^2+46x-30=17

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Solution for -8x^2+46x-30=17 equation:


Simplifying
-8x2 + 46x + -30 = 17

Reorder the terms:
-30 + 46x + -8x2 = 17

Solving
-30 + 46x + -8x2 = 17

Solving for variable 'x'.

Reorder the terms:
-30 + -17 + 46x + -8x2 = 17 + -17

Combine like terms: -30 + -17 = -47
-47 + 46x + -8x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-47 + 46x + -8x2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
5.875 + -5.75x + x2 = 0

Move the constant term to the right:

Add '-5.875' to each side of the equation.
5.875 + -5.75x + -5.875 + x2 = 0 + -5.875

Reorder the terms:
5.875 + -5.875 + -5.75x + x2 = 0 + -5.875

Combine like terms: 5.875 + -5.875 = 0.000
0.000 + -5.75x + x2 = 0 + -5.875
-5.75x + x2 = 0 + -5.875

Combine like terms: 0 + -5.875 = -5.875
-5.75x + x2 = -5.875

The x term is -5.75x.  Take half its coefficient (-2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
-5.75x + 8.265625 + x2 = -5.875 + 8.265625

Reorder the terms:
8.265625 + -5.75x + x2 = -5.875 + 8.265625

Combine like terms: -5.875 + 8.265625 = 2.390625
8.265625 + -5.75x + x2 = 2.390625

Factor a perfect square on the left side:
(x + -2.875)(x + -2.875) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(x + -2.875) equal to 1.54616461 and -1.54616461.

Subproblem 1

x + -2.875 = 1.54616461 Simplifying x + -2.875 = 1.54616461 Reorder the terms: -2.875 + x = 1.54616461 Solving -2.875 + x = 1.54616461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = 1.54616461 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = 1.54616461 + 2.875 x = 1.54616461 + 2.875 Combine like terms: 1.54616461 + 2.875 = 4.42116461 x = 4.42116461 Simplifying x = 4.42116461

Subproblem 2

x + -2.875 = -1.54616461 Simplifying x + -2.875 = -1.54616461 Reorder the terms: -2.875 + x = -1.54616461 Solving -2.875 + x = -1.54616461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = -1.54616461 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = -1.54616461 + 2.875 x = -1.54616461 + 2.875 Combine like terms: -1.54616461 + 2.875 = 1.32883539 x = 1.32883539 Simplifying x = 1.32883539

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.42116461, 1.32883539}

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