Question

2. Simplify the expression –4(x – 7) + 3(x + 9).
Need helpe can someone help me

Answer 1

first distribute the -4 and the 3

\(a(b+c)=ab+ac\)

Answer 2

then tell me what you got

Answer 3

7

Answer 4

? show me how you got 7

Answer 5

4+3=7

Answer 6

I said to distribute, not add them together...

\(-4(x-7)+3(x+9)=-4x+28+3(x+9)\)

I distributed the -4, now do something similar with \(3(x+9)\) and show me what you got.

Answer 7

i am confused i am not good with this stuff

Answer 8

if I tell you that \(a(b+c)=ab+ac\) then \(3(x+9)=?\)

Answer 9

3x+9?

Answer 10

3x+3*9

Answer 11

do you see how the 3 gets multiplied by the x and the 9?

Answer 12

this is very important.

Answer 13

yes

Answer 14

ok, so we have

\(-4(x-7)+3(x+9)=-4x+28+3(x+9)=\\ -4x+28+3x+27\)

Answer 15

you with me

Answer 16

?

Answer 17

yes

Answer 18

now group the like terms

\(-4x+3x+28+27\)

Answer 19

can you simplify that?

Answer 20

hold on

Answer 21

yes

Answer 22

what do you got?

Answer 23

54

Answer 24

what is \(-4x+3x\) ?

Answer 25

-1

Answer 26

the x does not go away

Answer 27

well then i dont know

Answer 28

Ok what about 3x+4x?

Answer 29

if you have 3 of something and you add 4 more, then you have 7 of that something

the something here is x, so 3x+4x=7x

make sense?

Answer 30

yes

Answer 31

So \(-4x+3x = -x\)

Answer 32

or \(-1*x\) (same thing(

Answer 33

but i need a answer

Answer 34

But we just write it as \(-x\)

Answer 35

ok so \(-4x+3x + 28+27 = -x+55\)

Answer 36

ok