9x^2+16x-357=

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Solution for 9x^2+16x-357= equation:


Simplifying
9x2 + 16x + -357 = 0

Reorder the terms:
-357 + 16x + 9x2 = 0

Solving
-357 + 16x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-39.66666667 + 1.777777778x + x2 = 0

Move the constant term to the right:

Add '39.66666667' to each side of the equation.
-39.66666667 + 1.777777778x + 39.66666667 + x2 = 0 + 39.66666667

Reorder the terms:
-39.66666667 + 39.66666667 + 1.777777778x + x2 = 0 + 39.66666667

Combine like terms: -39.66666667 + 39.66666667 = 0.00000000
0.00000000 + 1.777777778x + x2 = 0 + 39.66666667
1.777777778x + x2 = 0 + 39.66666667

Combine like terms: 0 + 39.66666667 = 39.66666667
1.777777778x + x2 = 39.66666667

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 = 39.66666667 + 0.7901234570

Reorder the terms:
0.7901234570 + 1.777777778x + x2 = 39.66666667 + 0.7901234570

Combine like terms: 39.66666667 + 0.7901234570 = 40.456790127
0.7901234570 + 1.777777778x + x2 = 40.456790127

Factor a perfect square on the left side:
(x + 0.888888889)(x + 0.888888889) = 40.456790127

Calculate the square root of the right side: 6.360565236

Break this problem into two subproblems by setting 
(x + 0.888888889) equal to 6.360565236 and -6.360565236.

Subproblem 1

x + 0.888888889 = 6.360565236 Simplifying x + 0.888888889 = 6.360565236 Reorder the terms: 0.888888889 + x = 6.360565236 Solving 0.888888889 + x = 6.360565236 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 = 6.360565236 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = 6.360565236 + -0.888888889 x = 6.360565236 + -0.888888889 Combine like terms: 6.360565236 + -0.888888889 = 5.471676347 x = 5.471676347 Simplifying x = 5.471676347

Subproblem 2

x + 0.888888889 = -6.360565236 Simplifying x + 0.888888889 = -6.360565236 Reorder the terms: 0.888888889 + x = -6.360565236 Solving 0.888888889 + x = -6.360565236 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 = -6.360565236 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = -6.360565236 + -0.888888889 x = -6.360565236 + -0.888888889 Combine like terms: -6.360565236 + -0.888888889 = -7.249454125 x = -7.249454125 Simplifying x = -7.249454125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.471676347, -7.249454125}

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