-x^2+15x+63=

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Solution for -x^2+15x+63= equation:


Simplifying
-1x2 + 15x + 63 = 0

Reorder the terms:
63 + 15x + -1x2 = 0

Solving
63 + 15x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-63 + -15x + x2 = 0

Move the constant term to the right:

Add '63' to each side of the equation.
-63 + -15x + 63 + x2 = 0 + 63

Reorder the terms:
-63 + 63 + -15x + x2 = 0 + 63

Combine like terms: -63 + 63 = 0
0 + -15x + x2 = 0 + 63
-15x + x2 = 0 + 63

Combine like terms: 0 + 63 = 63
-15x + x2 = 63

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = 63 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 63 + 56.25

Combine like terms: 63 + 56.25 = 119.25
56.25 + -15x + x2 = 119.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 119.25

Calculate the square root of the right side: 10.920164834

Break this problem into two subproblems by setting 
(x + -7.5) equal to 10.920164834 and -10.920164834.

Subproblem 1

x + -7.5 = 10.920164834 Simplifying x + -7.5 = 10.920164834 Reorder the terms: -7.5 + x = 10.920164834 Solving -7.5 + x = 10.920164834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 10.920164834 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 10.920164834 + 7.5 x = 10.920164834 + 7.5 Combine like terms: 10.920164834 + 7.5 = 18.420164834 x = 18.420164834 Simplifying x = 18.420164834

Subproblem 2

x + -7.5 = -10.920164834 Simplifying x + -7.5 = -10.920164834 Reorder the terms: -7.5 + x = -10.920164834 Solving -7.5 + x = -10.920164834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -10.920164834 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -10.920164834 + 7.5 x = -10.920164834 + 7.5 Combine like terms: -10.920164834 + 7.5 = -3.420164834 x = -3.420164834 Simplifying x = -3.420164834

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.420164834, -3.420164834}

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