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5, Mal and2 find the vali\begin{array}{l}{a+b} \\ {a^{\prime}-b^{\prime}} \\ {5 a^{\prime}-2 a b}\end{array} |
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Answer» when a = -1 and b = 2 i) a+b = -1+2 = 1iii) a³ -b³ = (-1)³ - (2)³ = -1 -8 = -9v) 5a³ -2ab = 5(-1)³ - 2×(-1)×(2) = -5 +2 = -3 |
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