Q26 of 60 Page 23

Factorise the following:

(i) 4

(i) 4x 2 + 20x + 25 = (2x) 2 + 2 × 2x × 5 + 5 2


= (2x + 5)2 [∵

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24

Factorise:

3 25

Using suitable identity, evaluate the following:

(i) 1033


(ii) 101 × 102


(iii) 9992

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Factorise the following:

(i) 9 28

Expand the following:

(i) (4