7x^2-3x+8=9x^2+15

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Solution for 7x^2-3x+8=9x^2+15 equation:


Simplifying
7x2 + -3x + 8 = 9x2 + 15

Reorder the terms:
8 + -3x + 7x2 = 9x2 + 15

Reorder the terms:
8 + -3x + 7x2 = 15 + 9x2

Solving
8 + -3x + 7x2 = 15 + 9x2

Solving for variable 'x'.

Reorder the terms:
8 + -15 + -3x + 7x2 + -9x2 = 15 + 9x2 + -15 + -9x2

Combine like terms: 8 + -15 = -7
-7 + -3x + 7x2 + -9x2 = 15 + 9x2 + -15 + -9x2

Combine like terms: 7x2 + -9x2 = -2x2
-7 + -3x + -2x2 = 15 + 9x2 + -15 + -9x2

Reorder the terms:
-7 + -3x + -2x2 = 15 + -15 + 9x2 + -9x2

Combine like terms: 15 + -15 = 0
-7 + -3x + -2x2 = 0 + 9x2 + -9x2
-7 + -3x + -2x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
-7 + -3x + -2x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(7 + 3x + 2x2) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(7 + 3x + 2x2)' equal to zero and attempt to solve: Simplifying 7 + 3x + 2x2 = 0 Solving 7 + 3x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 3.5 + 1.5x + x2 = 0 Move the constant term to the right: Add '-3.5' to each side of the equation. 3.5 + 1.5x + -3.5 + x2 = 0 + -3.5 Reorder the terms: 3.5 + -3.5 + 1.5x + x2 = 0 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + 1.5x + x2 = 0 + -3.5 1.5x + x2 = 0 + -3.5 Combine like terms: 0 + -3.5 = -3.5 1.5x + x2 = -3.5 The x term is 1.5x. Take half its coefficient (0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. 1.5x + 0.5625 + x2 = -3.5 + 0.5625 Reorder the terms: 0.5625 + 1.5x + x2 = -3.5 + 0.5625 Combine like terms: -3.5 + 0.5625 = -2.9375 0.5625 + 1.5x + x2 = -2.9375 Factor a perfect square on the left side: (x + 0.75)(x + 0.75) = -2.9375 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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