S sarkar_as Member Joined Oct 10, 2016 Messages 99 Gender Male HSC 2017 Nov 19, 2016 #1 I've done c i and ii but for iii is there a faster way to solve the equation than just expanding the whole thing? I've looked at the answers and they show a faster method but I don't understand it. Thanks.
I've done c i and ii but for iii is there a faster way to solve the equation than just expanding the whole thing? I've looked at the answers and they show a faster method but I don't understand it. Thanks.
S si2136 Well-Known Member Joined Jul 19, 2014 Messages 1,370 Gender Undisclosed HSC N/A Nov 19, 2016 #2 Unless you remember the formula, not that I know of.
I InteGrand Well-Known Member Joined Dec 11, 2014 Messages 6,109 Gender Male HSC N/A Nov 19, 2016 #3 sarkar_as said: I've done c i and ii but for iii is there a faster way to solve the equation than just expanding the whole thing? I've looked at the answers and they show a faster method but I don't understand it. Thanks.View attachment 33600View attachment 33601 Click to expand... They got their first set of three equations from the fact that alpha, beta, gamma are roots. They got the next equation by adding those three equations and rearranging. This allowed the previous results to be utilised.
sarkar_as said: I've done c i and ii but for iii is there a faster way to solve the equation than just expanding the whole thing? I've looked at the answers and they show a faster method but I don't understand it. Thanks.View attachment 33600View attachment 33601 Click to expand... They got their first set of three equations from the fact that alpha, beta, gamma are roots. They got the next equation by adding those three equations and rearranging. This allowed the previous results to be utilised.
