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Simplifying 5x2 + 9x = -21 Reorder the terms: 9x + 5x2 = -21 Solving 9x + 5x2 = -21 Solving for variable 'x'. Reorder the terms: 21 + 9x + 5x2 = -21 + 21 Combine like terms: -21 + 21 = 0 21 + 9x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 4.2 + 1.8x + x2 = 0 Move the constant term to the right: Add '-4.2' to each side of the equation. 4.2 + 1.8x + -4.2 + x2 = 0 + -4.2 Reorder the terms: 4.2 + -4.2 + 1.8x + x2 = 0 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + 1.8x + x2 = 0 + -4.2 1.8x + x2 = 0 + -4.2 Combine like terms: 0 + -4.2 = -4.2 1.8x + x2 = -4.2 The x term is 1.8x. Take half its coefficient (0.9). Square it (0.81) and add it to both sides. Add '0.81' to each side of the equation. 1.8x + 0.81 + x2 = -4.2 + 0.81 Reorder the terms: 0.81 + 1.8x + x2 = -4.2 + 0.81 Combine like terms: -4.2 + 0.81 = -3.39 0.81 + 1.8x + x2 = -3.39 Factor a perfect square on the left side: (x + 0.9)(x + 0.9) = -3.39 Can't calculate square root of the right side. The solution to this equation could not be determined.
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