Question Simplify the expression 4−4b+b2 Evaluate (2−b)2Use (a−b)2=a2−2ab+b2 to expand the expression 22−2×2b+b2Solution 4−4b+b2 Show Solution Find the roots b=2 Evaluate (2−b)2To find the roots of the expression,set the expression equal to 0 (2−b)2=0The only way a power can be 0 is when the base equals 0 2−b=0Move the constant to the right-hand side and change its sign −b=0−2Removing 0 doesn't change the value,so remove it from the expression −b=−2Solution b=2 Show Solution
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