Question

evaulate (98) square by using identies​

Answer 1

Answer:

(98)^2=(100-2)^2

(100-2)^2=(100)^2+(2)^2-2(100)(2)

=10000+4-400

=10004-400

=9604

the formula applied by (a+b)^2=(a)^2+(b)^2-2(ab)^2

Answer 2

$formulae \: used \\ {(a - b)}^{2} = {a}^{2} - 2 ab + {b }^{2} \\ = {a }^{2} - 2 \times a \times b + {b}^{2} \\ \\ {(98)}^{2} \\ = {(100 - 2)}^{2} \\ = {100}^{2} - 2 \times 100 \times 2 + {2}^{2} \\ = 10000 - 400 + 4 \\ = 10000 - 400 \\ = 9600 \\ = 9600 + 4 \\ = 9604 \\ \\ your \: answer \: is \: 9604 \: for \: {(98)}^{2}$

may this helps you