Question

What is the value of 54 – 4a2 + 3b3 when a = −2 and b = 4?

Answer 1

@ispike plz help

Answer 2

plz explain

Answer 3

please if I substitute a=-2 and b=4, into your expression, i get this:
\[54-4(-2)^{2}+3(4)^{3}=54-4*(4)+3*(64)=...\]

Answer 4

ok give me sec to figure it out plz

Answer 5

i will give my my answer in a second

Answer 6

ok so far i have 54-16+192

Answer 7

ok!

Answer 8

154?

Answer 9

54-16+192=38+192=...

Answer 10

what?

Answer 11

i did the PEMDAS thing

Answer 12

you add before you subtract

Answer 13

\[54-16+192=(54-16)+192=38+192=...\]

Answer 14

i got 230

Answer 15

that's right!
because subtraction and addition has the same precedence, so you have to solve for first the operand which you encounter for first in going from left to right!