How do you use pascals triangle to expand (2x-6)^7?
1 Answer
Aug 15, 2016
Explanation:
Using
color(blue)"Pascal's triangle"
![]()
here n = 7 : using the coefficients from the 7th row.
That is
color(red)(1,7,21,35,35,21,7,1) with decreasing powers of 2x from
(2x)^7to(2x)^0 and increasing powers of -6 from
(-6)^0to(-6)^7
=128x^7-2688x^6+24192x^5- ....... The remaining terms can be calculated in the same way.