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You mean this? \[4t^2(k+9)^7+20ts(k+9)^7+25s^2(k+9)^7\]?

Yup.

Well: \[=(k+9)^7(4t^2+20ts+25s^2) \] Got this part?

Yeah.

I know the answer but what's the steps?

Which step you don't understand. From there, you just need to factor 4t^2+20ts+25s^2

Yeah. I mean steps onhow you factored it

Are you sure have written the problem correctly?

YEAH

ok. so what's next with
(k+9)7(4t2+20ts+25s2)

Find two numbers A and B where
A*B=4*25=100
A+B=20

and .. ? that's how you get (k+9)7(4t2+20ts+25s2)?