Question Simplify the expression 1−3r+3r2−r3 Evaluate (1−r)3Use (a−b)3=a3−3a2b+3ab2−b3 to expand the expression 13−3×12×r+3×1×r2−r3Solution 1−3r+3r2−r3 Show Solution Find the roots r=1 Evaluate (1−r)3To find the roots of the expression,set the expression equal to 0 (1−r)3=0The only way a power can be 0 is when the base equals 0 1−r=0Move the constant to the right-hand side and change its sign −r=0−1Removing 0 doesn't change the value,so remove it from the expression −r=−1Solution r=1 Show Solution
Algebra
Calculus
Trigonometry
Matrix Algebra Calculus Trigonometry Matrix