What is the value of 4a - 2b when a is 7 and b is 4?

4a-2b

=4(7)+2(4)

=28+8

=36

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!