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loldanielol
Posts: **534**Registered User 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?

16Registered User New Member2,526Registered User Senior Member25,434Registered User Senior Member1,248Registered User Senior Member2,526Registered User Senior 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..

127. Junior Member156Registered User Junior 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...

36Registered User Junior 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

114Registered User Junior Member53Registered User Junior Member16Registered User New Member80Registered User Junior Member2,399Registered User Senior Member15Registered User New Member