Question

(5x-2)(5x-8) ???

Answer 1

do you know how to start? you will have to do 4 multiplications

Answer 2

25x^2-50x+16

Answer 3

4 ? multiplications ?

Answer 4

they are
\[5x\times 5x\]
\[5x\times -8\]
\[-2\times 5x\]
\[-2\times -8\]

Answer 5

it's called foil.....First Outer Inner Last 5x^2 x 5x^2 = 25x^2 is the First
Outer is 5x^2 x -8 = -40x
Inner is -2 x 5x = -10x
Last is -2 x -8 = 16

now combine like terms : 25x^2 -5x + 16

Answer 6

you get
\[25x^2\]
\[-40x\]
\[-10x\]
\[16\]

Answer 7

for a total of
\[25x^2-40x-10x+16\] combine like terms to get
\[25x^2-50x+16\]

Answer 8

i yam what i yam!

Answer 9

oh ok i understand

Answer 10

it is harder with polynomials but if you were going to multiply 12 by 23 you would do 4 multiplications right?

Answer 11

uhh lol

Answer 12

1 2
x 23
______
3 6
2 4

Answer 13

really it is identical

Answer 14

you would do 4 multiplications and one addition

Answer 15

polynomials work exactly the same way

Answer 16

ok

Answer 17

you could even write it the same way if you like. you just have to be careful of the signs

Answer 18

5x - 2
5x - 8
____________
-40x +16
25x^2 -10x

25x^2 -50x +16

Answer 19

but with polynomials most people write it from the top down instead of from the bottom up like we do with numbers. there is no carrying with polynomials. that is why

Answer 20

o