Question Simplify the expression 1−2r+r2 Evaluate (1−r)2Use (a−b)2=a2−2ab+b2 to expand the expression 12−2×1×r+r2Solution 1−2r+r2 Show Solution Find the roots r=1 Evaluate (1−r)2To find the roots of the expression,set the expression equal to 0 (1−r)2=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
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