Please fully solve it and give description with!THANKS (2p+q-r)^3
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Originally Posted by Peacewanters007 Please fully solve it and give description with!THANKS (2p+q-r)^3 To solve it we need an equation and that means (2p+q-r)^3 = something.... So, $\displaystyle (2p+q-r)^3 = ??$ Please give "full description"
Originally Posted by Peacewanters007 Please fully solve it and give description with!THANKS (2p+q-r)^3 You need to expand this? $\displaystyle (2p + q - r)^3 = ((2p + q) - r)^3$ By the binomial theorem: $\displaystyle = (2p + q)^3 + 3(2p + q)^2(-r) + 3(2p + q)(-r)^2 + (-r)^3$ You take it from here. -Dan
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