Question

6. Find the squares of the following numbers using the identity :
(a - b)2 = a2 - 2ab + b2
(i) 191 (ii) 189 (iii) 75​

Answer 1

Step-by-step explanation:

(191)2 =(200-9)2

=(200)2+(9)2-2(200)(9)

=40000+81-3600

=36481

Answer 2

Answer:

(i) 36481

(ii)35721

(iii)5605

Step-by-step explanation:

1.)  (191)²=(200-9)²

=(200)²+(9)²-2×200×9

=40000+81-3600

=36481

2.)  (189)²=(190-1)

⇒(190)²+(1)²-2×190×1

=36100+1-380

=35721

3) (75)²=(80-5)²

=(80)²+(5)²-2×80×5

=6400+25-800

=5605