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Simplifying 4x2 + 7x + 320 = 0 Reorder the terms: 320 + 7x + 4x2 = 0 Solving 320 + 7x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 80 + 1.75x + x2 = 0 Move the constant term to the right: Add '-80' to each side of the equation. 80 + 1.75x + -80 + x2 = 0 + -80 Reorder the terms: 80 + -80 + 1.75x + x2 = 0 + -80 Combine like terms: 80 + -80 = 0 0 + 1.75x + x2 = 0 + -80 1.75x + x2 = 0 + -80 Combine like terms: 0 + -80 = -80 1.75x + x2 = -80 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 = -80 + 0.765625 Reorder the terms: 0.765625 + 1.75x + x2 = -80 + 0.765625 Combine like terms: -80 + 0.765625 = -79.234375 0.765625 + 1.75x + x2 = -79.234375 Factor a perfect square on the left side: (x + 0.875)(x + 0.875) = -79.234375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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