Question Simplify the expression 14400−240x+x2 Evaluate (120−x)2Use (a−b)2=a2−2ab+b2 to expand the expression 1202−2×120x+x2Solution 14400−240x+x2 Show Solution Find the roots x=120 Evaluate (120−x)2To find the roots of the expression,set the expression equal to 0 (120−x)2=0The only way a power can be 0 is when the base equals 0 120−x=0Move the constant to the right-hand side and change its sign −x=0−120Removing 0 doesn't change the value,so remove it from the expression −x=−120Solution x=120 Show Solution
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