College Placement Test If x = –1 and y = 2, what is the value of the expression 2x3 – 3xy.
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College Placement Test If x = –1 and y = 2, what is the value of the expression 2x 3 – 3xy
?
A. 8 B. 4 C.
–1 D.
–4 E.
–8
(B) 4 Explanation:
1 3
(
1
)(
1
)(
1
)
Substitute -1 for x and 2 for y Follow the order of operations… 2
x
3
3
xy
2
(
1
)
3
3
(
1
)(
2
)
Exponents first… Multiply left to right… Add… 2
(
1
)
3
(
1
)(
2
)
2
6 4