Question Simplify the expression r2−18r+81 Evaluate (r−9)2Use (a−b)2=a2−2ab+b2 to expand the expression r2−2r×9+92Solution r2−18r+81 Show Solution Find the roots r=9 Evaluate (r−9)2To find the roots of the expression,set the expression equal to 0 (r−9)2=0The only way a power can be 0 is when the base equals 0 r−9=0Move the constant to the right-hand side and change its sign r=0+9Solution r=9 Show Solution
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