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Simplifying kx2 + 72x + 81 = 0 Reorder the terms: 81 + kx2 + 72x = 0 Solving 81 + kx2 + 72x = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + kx2 + -81 + 72x = 0 + -81 Reorder the terms: 81 + -81 + kx2 + 72x = 0 + -81 Combine like terms: 81 + -81 = 0 0 + kx2 + 72x = 0 + -81 kx2 + 72x = 0 + -81 Combine like terms: 0 + -81 = -81 kx2 + 72x = -81 Add '-72x' to each side of the equation. kx2 + 72x + -72x = -81 + -72x Combine like terms: 72x + -72x = 0 kx2 + 0 = -81 + -72x kx2 = -81 + -72x Divide each side by 'x2'. k = -81x-2 + -72x-1 Simplifying k = -81x-2 + -72x-1
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