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loldanielol
Registered User Posts: **534** Member

Has anyone used this book before, and if so, how did you do on the practice tests and on the real SAT?

Post edited by loldanielol on

## Replies to: Who has used Dr. John Chung's Math SAT book?

16New Member2,526Senior Member25,434Senior Member1,248Senior Member2,526Senior MemberSame with me, I'm just looking for a book that helps target the hardest problems on the SAT because I'm already very good at math and don't need to know how to do coordinate geometry or whatever..

127Junior Member156Junior MemberHere are the first two problems of the first practice test, talk about getting off to a rocky start. Or, maybe I'm just a moron.

1) If a(x+2)+b(x-1) = 3 for all x, then a =

A) -1 B) 0 C) 1 D) 2 E) 3

2) If a+b=2 and ab=-1, then a^2 + b^2 =

A) 4 B) 5 C) 6 D) 8 E) 10

Have fun...

36Junior MemberYou get a^2 + 2ab + b^2 = 4. Use the Commutative Property of Addition to rearange the equation.

a^2 + b^2 + 2ab = 4

You know that ab = -1 so substitute

a^2 + b^2 + 2(-1) = 4

a^2 + b^2 -2 = 4

a^2 + b^2 = 6

As I said this type of problem on the SAT is very common

114Junior Member53Junior Member16New Member81Junior Member2,455Senior Member15New Member