Question

i give madels out to every one who helps What is the value of the expression when a = 4 and b = 2?

https://static.k12.com/bank_packages/files/media/mathml_9d985d36d269bdc61c58f0bb096c9d5889a2cdff_1.gif


A.
48

B.
80

C.
120

D.
136

Answer 1

a = 4
b = 2

Replace each copy of 'a' with 4 and each copy of 'b' with 2

\[\Large 2a^3 + 2b^2 = 2({\color{red}{a}})^3+2({\color{blue}{b}})^2=2({\color{red}{4}})^3+2({\color{blue}{2}})^2\]
Are you able to finish up?

Answer 2

no i had that work they im stuck

Answer 3

think of (4)^3 as (4)*(4)*(4)

the exponent three means we have three copies of 4 multiplied

Answer 4

what is (4)^3 equal to?

Answer 5

64

Answer 6

yep, now double that to get what?

Answer 7

128

Answer 8

yes

Answer 9

now what is (2)^2 equal to?

Answer 10

that not a b c or d

Answer 11

what is (2)^2 equal to?

Answer 12

4

Answer 13

then 2 times 4 is equal to what?

Answer 14

8

Answer 15

So
\[\Large {\color{red}{2(4)^3}} + {\color{blue}{2(2)^2}} = {\color{red}{128}} + {\color{blue}{8}} = 136\]

Answer 16

thank u so much

Answer 17

no problem