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Simplifying 5x2 + 15 = 3x + -3 Reorder the terms: 15 + 5x2 = 3x + -3 Reorder the terms: 15 + 5x2 = -3 + 3x Solving 15 + 5x2 = -3 + 3x Solving for variable 'x'. Reorder the terms: 15 + 3 + -3x + 5x2 = -3 + 3x + 3 + -3x Combine like terms: 15 + 3 = 18 18 + -3x + 5x2 = -3 + 3x + 3 + -3x Reorder the terms: 18 + -3x + 5x2 = -3 + 3 + 3x + -3x Combine like terms: -3 + 3 = 0 18 + -3x + 5x2 = 0 + 3x + -3x 18 + -3x + 5x2 = 3x + -3x Combine like terms: 3x + -3x = 0 18 + -3x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 3.6 + -0.6x + x2 = 0 Move the constant term to the right: Add '-3.6' to each side of the equation. 3.6 + -0.6x + -3.6 + x2 = 0 + -3.6 Reorder the terms: 3.6 + -3.6 + -0.6x + x2 = 0 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + -0.6x + x2 = 0 + -3.6 -0.6x + x2 = 0 + -3.6 Combine like terms: 0 + -3.6 = -3.6 -0.6x + x2 = -3.6 The x term is -0.6x. Take half its coefficient (-0.3). Square it (0.09) and add it to both sides. Add '0.09' to each side of the equation. -0.6x + 0.09 + x2 = -3.6 + 0.09 Reorder the terms: 0.09 + -0.6x + x2 = -3.6 + 0.09 Combine like terms: -3.6 + 0.09 = -3.51 0.09 + -0.6x + x2 = -3.51 Factor a perfect square on the left side: (x + -0.3)(x + -0.3) = -3.51 Can't calculate square root of the right side. The solution to this equation could not be determined.
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