Question

Factor completely: x2 − 3x − 10

(x + 5)(x − 2)

(x − 10)(x + 1)

(x − 5)(x + 2)

(x + 10)(x − 1)

Answer 1

There are two ways to factorize these :

1)breaking the middle term
2)completing the whole square method


Which one would you prefer ?

Answer 2

You can also try to distribute all the answers, and she if they match your equation

Answer 3

Distribution please or if you could

Answer 4

Well @BrittanyFrench has told you a way to do it but you have to check all your options,which may take more time than breaking the middle term.

Answer 5

breaking the middle term it is... lol

Answer 6

Yeah, sorryy! Thats the only way I got taught. Maybe i'll watch you and have another way lol

Answer 7

Think of two numbers which we multiply we get -10 and when we add we get -3

Answer 8

-5 and 2

Answer 9

So replace -5x+2x in place of -3x in your equation.

Answer 10

x^2-(-5x+2x)?

Answer 11

-10

Answer 12

I said you to replace with -3x so the - sign also goes along with that.

Answer 13

x^2-5x+2x-10

Answer 14

Yeah right now take common from first two terms and last two terms.

Answer 15

x^2-5x= x(?) 2x-10= -2(?)

Answer 16

Lemme show you :(


x^2-5x+2x-10

x(x-5)+2(x-5)


Now you understand how we get this ?

Answer 17

lol yes thank you ^.^

Answer 18

So which one do you think is your answer dude ?

Answer 19

I feel like if I guess wrong u'll mentally slap me XD uh.. I think it's the third choice

Answer 20

Yeah you guessed right,so,don't worry.

You just need to practice a number of these:)

Answer 21

Thank you!