Expert: Bobby Soltani - 1/20/2006

Question
can you help me on these thanks.lesson 20 number (27),(29)
a-b(a^2-b) if a=-2 b=3 and this one also
-b^2a(a-b) if a=-3 b=2
just to many signs they confuse me thanks

Answer
a-b(a^2-b) if a=-2 b=3 and this one also

(-2)-(3)((-2)^2 - 3)
square the -2

(-2)-(3)(4 - 3)
simplify all the parenthesis
(-2)-(3)(1)
multiply
(-2) - 3
subtract
-5


-b^2a(a-b) if a=-3 b=2

-(2)^2*(-3)*(-3 - 2)
simplify the parenthesis

-(2)^2*(-3)*(-5)
exponent
-(4)*(-3)*(-5)
multiply

12*(-5)

-60

Let me know if you have questions.

Bobby