Question

3 Factorise the following using suitable identity. (a) 49x2 - 140xy + 100y2 (b) 25x2 - 144 (c) x2 - 121 (d) 81x2 + 108x + 36 (e) 25x2 - 40x + 16​

Answer 1

Answer:

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(a) 49x2- 140xy + 100y2

((a+b)^2= a^2+2ab+b^2)

(7+10)^2

(b) 25x2 - 144

= (5x)^2 - (12)^2

(c) x2-121

=x^2-11^2

(d) 81x2 + 108x + 36

(9x)^2+6^2

(e) 25x2 - 40x + 16

=(5x)^2-4^2

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