167.5=-4x^2+80x-150

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Solution for 167.5=-4x^2+80x-150 equation:


Simplifying
167.5 = -4x2 + 80x + -150

Reorder the terms:
167.5 = -150 + 80x + -4x2

Solving
167.5 = -150 + 80x + -4x2

Solving for variable 'x'.

Combine like terms: 167.5 + 150 = 317.5
317.5 + -80x + 4x2 = -150 + 80x + -4x2 + 150 + -80x + 4x2

Reorder the terms:
317.5 + -80x + 4x2 = -150 + 150 + 80x + -80x + -4x2 + 4x2

Combine like terms: -150 + 150 = 0
317.5 + -80x + 4x2 = 0 + 80x + -80x + -4x2 + 4x2
317.5 + -80x + 4x2 = 80x + -80x + -4x2 + 4x2

Combine like terms: 80x + -80x = 0
317.5 + -80x + 4x2 = 0 + -4x2 + 4x2
317.5 + -80x + 4x2 = -4x2 + 4x2

Combine like terms: -4x2 + 4x2 = 0
317.5 + -80x + 4x2 = 0

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

Divide each side by '4'.
79.375 + -20x + x2 = 0

Move the constant term to the right:

Add '-79.375' to each side of the equation.
79.375 + -20x + -79.375 + x2 = 0 + -79.375

Reorder the terms:
79.375 + -79.375 + -20x + x2 = 0 + -79.375

Combine like terms: 79.375 + -79.375 = 0.000
0.000 + -20x + x2 = 0 + -79.375
-20x + x2 = 0 + -79.375

Combine like terms: 0 + -79.375 = -79.375
-20x + x2 = -79.375

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -79.375 + 100

Reorder the terms:
100 + -20x + x2 = -79.375 + 100

Combine like terms: -79.375 + 100 = 20.625
100 + -20x + x2 = 20.625

Factor a perfect square on the left side:
(x + -10)(x + -10) = 20.625

Calculate the square root of the right side: 4.541475531

Break this problem into two subproblems by setting 
(x + -10) equal to 4.541475531 and -4.541475531.

Subproblem 1

x + -10 = 4.541475531 Simplifying x + -10 = 4.541475531 Reorder the terms: -10 + x = 4.541475531 Solving -10 + x = 4.541475531 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 4.541475531 + 10 Combine like terms: -10 + 10 = 0 0 + x = 4.541475531 + 10 x = 4.541475531 + 10 Combine like terms: 4.541475531 + 10 = 14.541475531 x = 14.541475531 Simplifying x = 14.541475531

Subproblem 2

x + -10 = -4.541475531 Simplifying x + -10 = -4.541475531 Reorder the terms: -10 + x = -4.541475531 Solving -10 + x = -4.541475531 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -4.541475531 + 10 Combine like terms: -10 + 10 = 0 0 + x = -4.541475531 + 10 x = -4.541475531 + 10 Combine like terms: -4.541475531 + 10 = 5.458524469 x = 5.458524469 Simplifying x = 5.458524469

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.541475531, 5.458524469}

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