Question

Using Suitable Identity ,Find the value of (i) (729)2-(271)2 (ii)98x107

Answer 1

Answer:

i) 458000

ii) 10486

Step-by-step explanation:

i) using identity: a^2 -b^2= (a+b)(a-b)

= (729+271)(729-271) = 1000(458) = 458000

ii) using identity : ( x +a)(x+ b)= x^2 + (a+b)x + ab

98 × 107 = (100 +(-2))(100+7) = 100^2 + (-2+7)100 + 7(-2) = 10000 +500 -14 = 10486

Hope it helps ☺