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Simplifying (3x + -9)(3x + 9) = 0 Reorder the terms: (-9 + 3x)(3x + 9) = 0 Reorder the terms: (-9 + 3x)(9 + 3x) = 0 Multiply (-9 + 3x) * (9 + 3x) (-9(9 + 3x) + 3x * (9 + 3x)) = 0 ((9 * -9 + 3x * -9) + 3x * (9 + 3x)) = 0 ((-81 + -27x) + 3x * (9 + 3x)) = 0 (-81 + -27x + (9 * 3x + 3x * 3x)) = 0 (-81 + -27x + (27x + 9x2)) = 0 Combine like terms: -27x + 27x = 0 (-81 + 0 + 9x2) = 0 (-81 + 9x2) = 0 Solving -81 + 9x2 = 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 + 9x2 = 0 + 81 Combine like terms: -81 + 81 = 0 0 + 9x2 = 0 + 81 9x2 = 0 + 81 Combine like terms: 0 + 81 = 81 9x2 = 81 Divide each side by '9'. x2 = 9 Simplifying x2 = 9 Take the square root of each side: x = {-3, 3}
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