Question

(2x+5)(x-4) my calulater got 150, but I don't know how it worked the problem. Can someone show how to work this out?

Answer 1

your calculator may not understand variables

Answer 2

you should do four multiplications, sometimes denoted by the unfortunate mnemonic device "FOIL' for "first, outer inner last"
or just multiply as you would for two 2 digit numbers

Answer 3

I'll try that.

Answer 4

good

Answer 5

I haven't done foil in a long time. I think I messed up. so far i have 2x^2+3x/x=-1/3. can you show how to foil this?

Answer 6

so far i have
2x^2-2x+5x+1=
2x^2+3x+1=
2x^2+3x=-1
2x^2+3x/3=-1/3
I don't know where to go from here

Answer 7

Is your equation equal to zero?