Question

What is the value of the expression when a = 5 and b = 3?

4a(2) - 5b(2)


A.
55

B.
74

C.
81

D.
145

I think either b or c, i need help plz!

Answer 1

I will give medal ;)

Answer 2

how did you get b or c ? :=)

Answer 3

by just doing adding the exponets with 4 and...... oh, i see

Answer 4

i did it wrong ;( one sec.

Answer 5

it was a!

Answer 6

yes right don't add exponents
take square of a and then multiply by 4
take square of b and then multiply by 5
last step subtract them

Answer 7

ok, thx nnesh

Answer 8

my pleasure.