Question

Evaluate the expression below when x = 3.

-2x - 8 -(-3x + 8)

Answer 1

Firstly solve the brackets :

Multiply - to brackets first...

Answer 2

Can you do that??

Answer 3

-1?

Answer 4

Yes distribute -1 to the brackets...

Don't plug in the value x = 3 now...

Answer 5

your confusing me

Answer 6

I think you have substituted the value :

According to you : (-3(3) + 8) = (-9 + 8) = -1

Right ??

Answer 7

So now you have got :

-2x - 8 - (-1)

Right ??

Answer 8

okay so how do i solve that? do i plug in the 1

Answer 9

No.. again substitute x = 3 in place of x..

And tell me what did you get after that..

Answer 10

-10

Answer 11

Can you show how you got this ??

Answer 12

i plugged in the 3 for x.

Answer 13

Can you show me that??

Answer 14

..............................

Answer 15

Ha ha ha ha...

Try man, you can do that..

See : you have -2x - 8 here put x = 3 and tell me what did you get ??