Question Simplify the expression 4n2−28n+49 Evaluate (2n−7)2Use (a−b)2=a2−2ab+b2 to expand the expression (2n)2−2×2n×7+72Solution 4n2−28n+49 Show Solution Find the roots n=27Alternative Form n=3.5 Evaluate (2n−7)2To find the roots of the expression,set the expression equal to 0 (2n−7)2=0The only way a power can be 0 is when the base equals 0 2n−7=0Move the constant to the right-hand side and change its sign 2n=0+7Removing 0 doesn't change the value,so remove it from the expression 2n=7Divide both sides 22n=27Solution n=27Alternative Form n=3.5 Show Solution
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