Question

Evaluate the following expression for a = 6 and b = -2
3a + b2 + 4b – a

A. 4
B. 12
C. 8
D. 16

Answer 1

why don't you replace a with 6 and b with -2 and do the arithmetic?

Answer 2

*3a + b^2 + 4b – a

Answer 3

yes, but you did not put in 6 everywhere there is an "a" and -2 for every b

Answer 4

3(6) + (-2)^2 + 4(-2) - 6 is that what you mean?

Answer 5

yes. now do the arithmetic

Answer 6

you do know that 3(6) is short for 3*6 (3 times 6) right?

Answer 7

Omg of course ...I already did what you're talking about. I just never get the same answer as the multiple choice

Answer 8

do it in steps what is
3*6

what is (-2)^2
what is 4*-2 -6

now add them up

Answer 9

Wait ..why the 4 isn't -4 ?

Answer 10

3(6) + (-2)^2 + 4(-2) - 6
write the answers to each multiplication (or square for (-2)^2 ) below each term

Answer 11

18 + (-4) + (-8) - 6

Answer 12

do you know that (-2)^2 is short hand for -2 * -2
do you think -2 * -2 is -4?

Answer 13

Oh no i didn't know it was -2. Lol thanks for explaining

Answer 14

btw, if you see (-2)^3 that means -2* -2 * -2 which is (-2*-2) * -2 or 4*-2 or -8

Answer 15

Yes, i know that. Thanks

Answer 16

did you get a final answer?

Answer 17

Yes, 8.