Question Simplify the expression 4−4a+a2 Evaluate (2−a)2Use (a−b)2=a2−2ab+b2 to expand the expression 22−2×2a+a2Solution 4−4a+a2 Show Solution Find the roots a=2 Evaluate (2−a)2To find the roots of the expression,set the expression equal to 0 (2−a)2=0The only way a power can be 0 is when the base equals 0 2−a=0Move the constant to the right-hand side and change its sign −a=0−2Removing 0 doesn't change the value,so remove it from the expression −a=−2Solution a=2 Show Solution
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