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Simplifying 0 = 4x2 + 9x + 7 Reorder the terms: 0 = 7 + 9x + 4x2 Solving 0 = 7 + 9x + 4x2 Solving for variable 'x'. Combine like terms: 0 + -7 = -7 -7 + -9x + -4x2 = 7 + 9x + 4x2 + -7 + -9x + -4x2 Reorder the terms: -7 + -9x + -4x2 = 7 + -7 + 9x + -9x + 4x2 + -4x2 Combine like terms: 7 + -7 = 0 -7 + -9x + -4x2 = 0 + 9x + -9x + 4x2 + -4x2 -7 + -9x + -4x2 = 9x + -9x + 4x2 + -4x2 Combine like terms: 9x + -9x = 0 -7 + -9x + -4x2 = 0 + 4x2 + -4x2 -7 + -9x + -4x2 = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 -7 + -9x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(7 + 9x + 4x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(7 + 9x + 4x2)' equal to zero and attempt to solve: Simplifying 7 + 9x + 4x2 = 0 Solving 7 + 9x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 1.75 + 2.25x + x2 = 0 Move the constant term to the right: Add '-1.75' to each side of the equation. 1.75 + 2.25x + -1.75 + x2 = 0 + -1.75 Reorder the terms: 1.75 + -1.75 + 2.25x + x2 = 0 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + 2.25x + x2 = 0 + -1.75 2.25x + x2 = 0 + -1.75 Combine like terms: 0 + -1.75 = -1.75 2.25x + x2 = -1.75 The x term is 2.25x. 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. 2.25x + 1.265625 + x2 = -1.75 + 1.265625 Reorder the terms: 1.265625 + 2.25x + x2 = -1.75 + 1.265625 Combine like terms: -1.75 + 1.265625 = -0.484375 1.265625 + 2.25x + x2 = -0.484375 Factor a perfect square on the left side: (x + 1.125)(x + 1.125) = -0.484375 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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