Question Simplify the expression 8a3−12a2+6a−1 Evaluate (2a−1)3Use (a−b)3=a3−3a2b+3ab2−b3 to expand the expression (2a)3−3(2a)2×1+3×2a×12−13Solution 8a3−12a2+6a−1 Show Solution Find the roots a=21Alternative Form a=0.5 Evaluate (2a−1)3To find the roots of the expression,set the expression equal to 0 (2a−1)3=0The only way a power can be 0 is when the base equals 0 2a−1=0Move the constant to the right-hand side and change its sign 2a=0+1Removing 0 doesn't change the value,so remove it from the expression 2a=1Divide both sides 22a=21Solution a=21Alternative Form a=0.5 Show Solution
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