9x^2+16x+64=88

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Solution for 9x^2+16x+64=88 equation:


Simplifying
9x2 + 16x + 64 = 88

Reorder the terms:
64 + 16x + 9x2 = 88

Solving
64 + 16x + 9x2 = 88

Solving for variable 'x'.

Reorder the terms:
64 + -88 + 16x + 9x2 = 88 + -88

Combine like terms: 64 + -88 = -24
-24 + 16x + 9x2 = 88 + -88

Combine like terms: 88 + -88 = 0
-24 + 16x + 9x2 = 0

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

Divide each side by '9'.
-2.666666667 + 1.777777778x + x2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + 1.777777778x + 2.666666667 + x2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + 1.777777778x + x2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + 1.777777778x + x2 = 0 + 2.666666667
1.777777778x + x2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
1.777777778x + x2 = 2.666666667

The x term is 1.777777778x.  Take half its coefficient (0.888888889).
Square it (0.7901234570) and add it to both sides.

Add '0.7901234570' to each side of the equation.
1.777777778x + 0.7901234570 + x2 = 2.666666667 + 0.7901234570

Reorder the terms:
0.7901234570 + 1.777777778x + x2 = 2.666666667 + 0.7901234570

Combine like terms: 2.666666667 + 0.7901234570 = 3.456790124
0.7901234570 + 1.777777778x + x2 = 3.456790124

Factor a perfect square on the left side:
(x + 0.888888889)(x + 0.888888889) = 3.456790124

Calculate the square root of the right side: 1.859244504

Break this problem into two subproblems by setting 
(x + 0.888888889) equal to 1.859244504 and -1.859244504.

Subproblem 1

x + 0.888888889 = 1.859244504 Simplifying x + 0.888888889 = 1.859244504 Reorder the terms: 0.888888889 + x = 1.859244504 Solving 0.888888889 + x = 1.859244504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.888888889' to each side of the equation. 0.888888889 + -0.888888889 + x = 1.859244504 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = 1.859244504 + -0.888888889 x = 1.859244504 + -0.888888889 Combine like terms: 1.859244504 + -0.888888889 = 0.970355615 x = 0.970355615 Simplifying x = 0.970355615

Subproblem 2

x + 0.888888889 = -1.859244504 Simplifying x + 0.888888889 = -1.859244504 Reorder the terms: 0.888888889 + x = -1.859244504 Solving 0.888888889 + x = -1.859244504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.888888889' to each side of the equation. 0.888888889 + -0.888888889 + x = -1.859244504 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = -1.859244504 + -0.888888889 x = -1.859244504 + -0.888888889 Combine like terms: -1.859244504 + -0.888888889 = -2.748133393 x = -2.748133393 Simplifying x = -2.748133393

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.970355615, -2.748133393}

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