Mathematics
Evaluate:
(i) (674)2 - (326)2
(ii) (18.6)2 - (1.4)2
Factorisation
1 Like
Answer
(i) Given,
⇒ (674)2 - (326)2
By using the identity,
(a2 - b2) = (a + b)(a - b)
⇒ (674 + 326)(674 - 326)
⇒ (1000)(348)
⇒ 348000.
Hence, (674)2 - (326)2 = 348000.
(ii) Given,
⇒ (18.6)2 - (1.4)2
By using the identity,
(a2 - b2) = (a + b)(a - b)
⇒ (18.6 + 1.4)(18.6 - 1.4)
⇒ (20)(17.2)
⇒ 344.
Hence, (18.6)2 - (1.4)2 = 344.
Answered By
3 Likes