-4g^2+9g+7=0

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Solution for -4g^2+9g+7=0 equation:


Simplifying
-4g2 + 9g + 7 = 0

Reorder the terms:
7 + 9g + -4g2 = 0

Solving
7 + 9g + -4g2 = 0

Solving for variable 'g'.

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

Divide each side by '-4'.
-1.75 + -2.25g + g2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -2.25g + 1.75 + g2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -2.25g + g2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -2.25g + g2 = 0 + 1.75
-2.25g + g2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-2.25g + g2 = 1.75

The g term is -2.25g.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25g + 1.265625 + g2 = 1.75 + 1.265625

Reorder the terms:
1.265625 + -2.25g + g2 = 1.75 + 1.265625

Combine like terms: 1.75 + 1.265625 = 3.015625
1.265625 + -2.25g + g2 = 3.015625

Factor a perfect square on the left side:
(g + -1.125)(g + -1.125) = 3.015625

Calculate the square root of the right side: 1.736555499

Break this problem into two subproblems by setting 
(g + -1.125) equal to 1.736555499 and -1.736555499.

Subproblem 1

g + -1.125 = 1.736555499 Simplifying g + -1.125 = 1.736555499 Reorder the terms: -1.125 + g = 1.736555499 Solving -1.125 + g = 1.736555499 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + g = 1.736555499 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + g = 1.736555499 + 1.125 g = 1.736555499 + 1.125 Combine like terms: 1.736555499 + 1.125 = 2.861555499 g = 2.861555499 Simplifying g = 2.861555499

Subproblem 2

g + -1.125 = -1.736555499 Simplifying g + -1.125 = -1.736555499 Reorder the terms: -1.125 + g = -1.736555499 Solving -1.125 + g = -1.736555499 Solving for variable 'g'. Move all terms containing g to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + g = -1.736555499 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + g = -1.736555499 + 1.125 g = -1.736555499 + 1.125 Combine like terms: -1.736555499 + 1.125 = -0.611555499 g = -0.611555499 Simplifying g = -0.611555499

Solution

The solution to the problem is based on the solutions from the subproblems. g = {2.861555499, -0.611555499}

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