Question Simplify the expression 81−18x+x2 Evaluate (9−x)2Use (a−b)2=a2−2ab+b2 to expand the expression 92−2×9x+x2Solution 81−18x+x2 Show Solution Find the roots x=9 Evaluate (9−x)2To find the roots of the expression,set the expression equal to 0 (9−x)2=0The only way a power can be 0 is when the base equals 0 9−x=0Move the constant to the right-hand side and change its sign −x=0−9Removing 0 doesn't change the value,so remove it from the expression −x=−9Solution x=9 Show Solution
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