comments on: sat algebra: combination vs. substitution - 加拿大vs摩洛哥欧赔 //www.catharsisit.com/hs/sat/sat-algebra-combination-vs-substitution/ act, sat, college admissions, life wed, 24 oct 2018 10:30:21 +0000 hourly 1 by: magoosh test prep expert //www.catharsisit.com/hs/sat/sat-algebra-combination-vs-substitution/#comment-203814 sat, 18 nov 2017 03:04:47 +0000 //www.catharsisit.com/sat/?p=1000#comment-203814 in reply to patty.

hi patty,

we had (y-1)^2 which we expanded to (y-1)(y-1). after that, we foiled and did all the multiplication, so:

= (y-1)(y-1)
= y^2 – y – y + 1
= y^2 -2y + 1

i hope that helps! 🙂

]]> by: patty //www.catharsisit.com/hs/sat/sat-algebra-combination-vs-substitution/#comment-203805 fri, 17 nov 2017 13:01:55 +0000 //www.catharsisit.com/sat/?p=1000#comment-203805 how did you get the -2y in the substitution problem?

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