Question Simplify the expression 225−30x+x2 Evaluate (15−x)2Use (a−b)2=a2−2ab+b2 to expand the expression 152−2×15x+x2Solution 225−30x+x2 Show Solution Find the roots x=15 Evaluate (15−x)2To find the roots of the expression,set the expression equal to 0 (15−x)2=0The only way a power can be 0 is when the base equals 0 15−x=0Move the constant to the right-hand side and change its sign −x=0−15Removing 0 doesn't change the value,so remove it from the expression −x=−15Solution x=15 Show Solution