Q3 of 59 Page 162

Expand:

(i) (4x + 3)2


(ii) (x + 2y)2


(iii)


(iv)

(i) We use (a + b)2 = a2 + 2ab + b2


⇒ (4x + 3)2 = (4x)2 + 2× 4x × 3 + 32


⇒ (4x + 3)2 = 16x2 + 24x + 9


(ii) We use (a + b)2 = a2 + 2ab + b2


⇒(x + 2y)2 = x2 + 4xy + 4y2


(iii) We use (a + b)2 = a2 + 2ab + b2



(iv) We use (a - b)2 = a2- 2ab + b2



More from this chapter

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1

The product 58 × 62 is

 2

Take away 8x – 7y – 8p + 10q from 10x + 10y – 7p + 9q.

 4

Expand:

(i) (2t + 5)(2t – 5);


(ii) (xy + 8)(xy – 8);


(iii) (2x + 3y)(2x – 3y).

 5

Expand:

(n – 1)(n + 1)(n2 + 1)