Question Simplify the expression 81x2−36x+4 Evaluate (9x−2)2Use (a−b)2=a2−2ab+b2 to expand the expression (9x)2−2×9x×2+22Solution 81x2−36x+4 Show Solution Find the roots x=92Alternative Form x=0.2˙ Evaluate (9x−2)2To find the roots of the expression,set the expression equal to 0 (9x−2)2=0The only way a power can be 0 is when the base equals 0 9x−2=0Move the constant to the right-hand side and change its sign 9x=0+2Removing 0 doesn't change the value,so remove it from the expression 9x=2Divide both sides 99x=92Solution x=92Alternative Form x=0.2˙ Show Solution
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