How do i work out this sum???

Question

Substitute a=5, b=-4, c=11.

3b squared -5a squared c/4b

Answer 1

[3(-4)]^2 – [5 (5)]^2 * 11

            4(-4)

= -144  - 625 *11/-16

=330.69

Answer 2

i am not completely sure but i think:

(3 times-4) multiply then square it . but if there exist no parentheses then u just square the "b" then u multiply it to 3

think : Parentheses, exponent/powers, multiply*, divide*, add, subtract

* multiply and divide can be done in either order from left to right

Answer 3

r those three different problems or are they all in one problem??..is it:

3b^2-5b^2 ? c/4b I am a little confused