Question Simplify the expression 81−36y+4y2 Evaluate (9−2y)2Use (a−b)2=a2−2ab+b2 to expand the expression 92−2×9×2y+(2y)2Solution 81−36y+4y2 Show Solution Find the roots y=29Alternative Form y=4.5 Evaluate (9−2y)2To find the roots of the expression,set the expression equal to 0 (9−2y)2=0The only way a power can be 0 is when the base equals 0 9−2y=0Move the constant to the right-hand side and change its sign −2y=0−9Removing 0 doesn't change the value,so remove it from the expression −2y=−9Change the signs on both sides of the equation 2y=9Divide both sides 22y=29Solution y=29Alternative Form y=4.5 Show Solution
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