**8/25/2014
**If *a*(*x
*+ 2) + *b*(*x
–* 1) = 3 for all *x*,
then *a* =

a)
-1

b) 0

c) 1

d) 2

e) 3

**Scroll
down for the solution.**

**8/25/2014
**Solution.
**C.
**Since
the equation is true for all *x,
*and
we seek *a*,
we can cleverly substitute *x*
=
1 throughout so that the expression with *b
*collapses
→ *a*
=
1.