Posted by **keisha** on Thursday, May 22, 2008 at 11:07am.

find the value of each of the following when a=2,b=-1 and c=3

1)a(b+c)=2(-1+3)=1

2)4b^2-2ac/a+b+c= 4(-1)^2-2(2)(3)/2+-1+3

ans=-8/4=-2

- math (did i do this right) -
**Quidditch**, Thursday, May 22, 2008 at 1:49pm
1. You substituted OK, but...

2(-1+3)

=2(2)

=?

2. Again, the substitution is OK, but...

4((-1)^2 - 2(2)(3)/2 + -1 + 3

=4(1) - 12/2 - 1 + 3

=4 - 6 - 1 + 3

=?

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