-5x^2+9+7x=0

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Solution for -5x^2+9+7x=0 equation:


Simplifying
-5x2 + 9 + 7x = 0

Reorder the terms:
9 + 7x + -5x2 = 0

Solving
9 + 7x + -5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-1.8 + -1.4x + x2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -1.4x + 1.8 + x2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -1.4x + x2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -1.4x + x2 = 0 + 1.8
-1.4x + x2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-1.4x + x2 = 1.8

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 1.8 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 1.8 + 0.49

Combine like terms: 1.8 + 0.49 = 2.29
0.49 + -1.4x + x2 = 2.29

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 2.29

Calculate the square root of the right side: 1.513274595

Break this problem into two subproblems by setting 
(x + -0.7) equal to 1.513274595 and -1.513274595.

Subproblem 1

x + -0.7 = 1.513274595 Simplifying x + -0.7 = 1.513274595 Reorder the terms: -0.7 + x = 1.513274595 Solving -0.7 + x = 1.513274595 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 1.513274595 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 1.513274595 + 0.7 x = 1.513274595 + 0.7 Combine like terms: 1.513274595 + 0.7 = 2.213274595 x = 2.213274595 Simplifying x = 2.213274595

Subproblem 2

x + -0.7 = -1.513274595 Simplifying x + -0.7 = -1.513274595 Reorder the terms: -0.7 + x = -1.513274595 Solving -0.7 + x = -1.513274595 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -1.513274595 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -1.513274595 + 0.7 x = -1.513274595 + 0.7 Combine like terms: -1.513274595 + 0.7 = -0.813274595 x = -0.813274595 Simplifying x = -0.813274595

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.213274595, -0.813274595}

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