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Simplifying -5x^{2}+ 80 = 0 Reorder the terms: 80 + -5x^{2}= 0 Solving 80 + -5x^{2}= 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-80' to each side of the equation. 80 + -80 + -5x^{2}= 0 + -80 Combine like terms: 80 + -80 = 0 0 + -5x^{2}= 0 + -80 -5x^{2}= 0 + -80 Combine like terms: 0 + -80 = -80 -5x^{2}= -80 Divide each side by '-5'. x^{2}= 16 Simplifying x^{2}= 16 Take the square root of each side: x = {-4, 4}

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