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Simplifying 0 = 4x2 + 7x + 8 Reorder the terms: 0 = 8 + 7x + 4x2 Solving 0 = 8 + 7x + 4x2 Solving for variable 'x'. Combine like terms: 0 + -8 = -8 -8 + -7x + -4x2 = 8 + 7x + 4x2 + -8 + -7x + -4x2 Reorder the terms: -8 + -7x + -4x2 = 8 + -8 + 7x + -7x + 4x2 + -4x2 Combine like terms: 8 + -8 = 0 -8 + -7x + -4x2 = 0 + 7x + -7x + 4x2 + -4x2 -8 + -7x + -4x2 = 7x + -7x + 4x2 + -4x2 Combine like terms: 7x + -7x = 0 -8 + -7x + -4x2 = 0 + 4x2 + -4x2 -8 + -7x + -4x2 = 4x2 + -4x2 Combine like terms: 4x2 + -4x2 = 0 -8 + -7x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(8 + 7x + 4x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(8 + 7x + 4x2)' equal to zero and attempt to solve: Simplifying 8 + 7x + 4x2 = 0 Solving 8 + 7x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 2 + 1.75x + x2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + 1.75x + -2 + x2 = 0 + -2 Reorder the terms: 2 + -2 + 1.75x + x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 1.75x + x2 = 0 + -2 1.75x + x2 = 0 + -2 Combine like terms: 0 + -2 = -2 1.75x + x2 = -2 The x term is 1.75x. Take half its coefficient (0.875). Square it (0.765625) and add it to both sides. Add '0.765625' to each side of the equation. 1.75x + 0.765625 + x2 = -2 + 0.765625 Reorder the terms: 0.765625 + 1.75x + x2 = -2 + 0.765625 Combine like terms: -2 + 0.765625 = -1.234375 0.765625 + 1.75x + x2 = -1.234375 Factor a perfect square on the left side: (x + 0.875)(x + 0.875) = -1.234375 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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