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Simplifying 4x2 + -81 = 0 Reorder the terms: -81 + 4x2 = 0 Solving -81 + 4x2 = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 4x2 = 0 + 81 Combine like terms: -81 + 81 = 0 0 + 4x2 = 0 + 81 4x2 = 0 + 81 Combine like terms: 0 + 81 = 81 4x2 = 81 Divide each side by '4'. x2 = 20.25 Simplifying x2 = 20.25 Take the square root of each side: x = {-4.5, 4.5}
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