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Simplifying 0.4x2 + 2x + 90 = 80 Reorder the terms: 90 + 2x + 0.4x2 = 80 Solving 90 + 2x + 0.4x2 = 80 Solving for variable 'x'. Reorder the terms: 90 + -80 + 2x + 0.4x2 = 80 + -80 Combine like terms: 90 + -80 = 10 10 + 2x + 0.4x2 = 80 + -80 Combine like terms: 80 + -80 = 0 10 + 2x + 0.4x2 = 0 Begin completing the square. Divide all terms by 0.4 the coefficient of the squared term: Divide each side by '0.4'. 25 + 5x + x2 = 0 Move the constant term to the right: Add '-25' to each side of the equation. 25 + 5x + -25 + x2 = 0 + -25 Reorder the terms: 25 + -25 + 5x + x2 = 0 + -25 Combine like terms: 25 + -25 = 0 0 + 5x + x2 = 0 + -25 5x + x2 = 0 + -25 Combine like terms: 0 + -25 = -25 5x + x2 = -25 The x term is 5x. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5x + 6.25 + x2 = -25 + 6.25 Reorder the terms: 6.25 + 5x + x2 = -25 + 6.25 Combine like terms: -25 + 6.25 = -18.75 6.25 + 5x + x2 = -18.75 Factor a perfect square on the left side: (x + 2.5)(x + 2.5) = -18.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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