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Simplifying 4x(x + 3) + -7(x + -3) = 0 Reorder the terms: 4x(3 + x) + -7(x + -3) = 0 (3 * 4x + x * 4x) + -7(x + -3) = 0 (12x + 4x2) + -7(x + -3) = 0 Reorder the terms: 12x + 4x2 + -7(-3 + x) = 0 12x + 4x2 + (-3 * -7 + x * -7) = 0 12x + 4x2 + (21 + -7x) = 0 Reorder the terms: 21 + 12x + -7x + 4x2 = 0 Combine like terms: 12x + -7x = 5x 21 + 5x + 4x2 = 0 Solving 21 + 5x + 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'. 5.25 + 1.25x + x2 = 0 Move the constant term to the right: Add '-5.25' to each side of the equation. 5.25 + 1.25x + -5.25 + x2 = 0 + -5.25 Reorder the terms: 5.25 + -5.25 + 1.25x + x2 = 0 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + 1.25x + x2 = 0 + -5.25 1.25x + x2 = 0 + -5.25 Combine like terms: 0 + -5.25 = -5.25 1.25x + x2 = -5.25 The x term is 1.25x. Take half its coefficient (0.625). Square it (0.390625) and add it to both sides. Add '0.390625' to each side of the equation. 1.25x + 0.390625 + x2 = -5.25 + 0.390625 Reorder the terms: 0.390625 + 1.25x + x2 = -5.25 + 0.390625 Combine like terms: -5.25 + 0.390625 = -4.859375 0.390625 + 1.25x + x2 = -4.859375 Factor a perfect square on the left side: (x + 0.625)(x + 0.625) = -4.859375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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