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Simplifying 4 = y * y Multiply y * y 4 = y2 Solving 4 = y2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y2' to each side of the equation. 4 + -1y2 = y2 + -1y2 Combine like terms: y2 + -1y2 = 0 4 + -1y2 = 0 Add '-4' to each side of the equation. 4 + -4 + -1y2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1y2 = 0 + -4 -1y2 = 0 + -4 Combine like terms: 0 + -4 = -4 -1y2 = -4 Divide each side by '-1'. y2 = 4 Simplifying y2 = 4 Take the square root of each side: y = {-2, 2}
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