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Simplifying 4x2 + 9x + 15 = -20 Reorder the terms: 15 + 9x + 4x2 = -20 Solving 15 + 9x + 4x2 = -20 Solving for variable 'x'. Reorder the terms: 15 + 20 + 9x + 4x2 = -20 + 20 Combine like terms: 15 + 20 = 35 35 + 9x + 4x2 = -20 + 20 Combine like terms: -20 + 20 = 0 35 + 9x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 8.75 + 2.25x + x2 = 0 Move the constant term to the right: Add '-8.75' to each side of the equation. 8.75 + 2.25x + -8.75 + x2 = 0 + -8.75 Reorder the terms: 8.75 + -8.75 + 2.25x + x2 = 0 + -8.75 Combine like terms: 8.75 + -8.75 = 0.00 0.00 + 2.25x + x2 = 0 + -8.75 2.25x + x2 = 0 + -8.75 Combine like terms: 0 + -8.75 = -8.75 2.25x + x2 = -8.75 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 = -8.75 + 1.265625 Reorder the terms: 1.265625 + 2.25x + x2 = -8.75 + 1.265625 Combine like terms: -8.75 + 1.265625 = -7.484375 1.265625 + 2.25x + x2 = -7.484375 Factor a perfect square on the left side: (x + 1.125)(x + 1.125) = -7.484375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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