Question Simplify the expression 49−14a+a2 Evaluate (7−a)2Use (a−b)2=a2−2ab+b2 to expand the expression 72−2×7a+a2Solution 49−14a+a2 Show Solution Find the roots a=7 Evaluate (7−a)2To find the roots of the expression,set the expression equal to 0 (7−a)2=0The only way a power can be 0 is when the base equals 0 7−a=0Move the constant to the right-hand side and change its sign −a=0−7Removing 0 doesn't change the value,so remove it from the expression −a=−7Solution a=7 Show Solution
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