Question

Factorize each expression. (a) r² +2rt - 2st - rs​

Answer 1

so first split into two

`(r^2+2rt) (-2st-rs)`

now we can factorise each

`r(r+2t) -s(2t+r)`

now the inside of the bracket is the same so we can reconfigure like this

`(r-s)(r+2t)`

all i did was put the two outside terms together to make (r-s)

this is your answer

(r-s)(r+2t)