Question Simplify the expression Solution 4n2−76n+361 Evaluate (2n−19)2Use (a−b)2=a2−2ab+b2 to expand the expression (2n)2−2×2n×19+192Solution 4n2−76n+361 Show Solution Find the roots Find the roots of the algebra expression n=219Alternative Form n=9.5 Evaluate (2n−19)2To find the roots of the expression,set the expression equal to 0 (2n−19)2=0The only way a power can be 0 is when the base equals 0 2n−19=0Move the constant to the right-hand side and change its sign 2n=0+19Removing 0 doesn't change the value,so remove it from the expression 2n=19Divide both sides 22n=219Solution n=219Alternative Form n=9.5 Show Solution