Question

What is the value of 4a^3 – 2b^2 + 5 when a = 3 and b = −2?

Answer 1

You have to do the exponents first before multiplying anything else..

Answer 2

Do i subtract the exponents?

Answer 3

Noo, just do the exponent first, because what you did will give you a totally different answer.. lemme show you what I mean:

If we did what you did: \(\large 4*3^3 \) would give \(\large 12^3 \) which is \(\large 1728\) ..

As opposed to \(\large 4*(3^3) \) which should be \(\large 4*27 \) which is \(\large 108\)

Answer 4

See the difference in just the first term?

Answer 5

Ah, I see what you did.