Question

.Factorise 121r² - 144s²
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Answer 1

Step-by-step explanation:

121r²-144s²

= (11r)²-(12s)²

=(11r-12s) (11r+12s)

Hope you understood.

Answer 2

Answer:

(11r+12s)(11r-12s)

Step-by-step explanation:

we know that,

A^2-B^2=(A+B)(A-B)

11^2=121 and 12^2=144

So (11r)^2-(12s)^2=(11r+12s)(11r-12s)