Question

plz give urgent.
find the square of the following by using identity​

Answer 1

Answer:

1)6241

2)529

3)1681

4)5180

5)10404

Step-by-step explanation:

1) 79^2=(80-1)^2

=80^2-2×80×1+1^2

=6400-160+1

=6241

2)23^2=(20+3)^2

=20^2+2×20×3+3^2

=400+120+9

=529

3)41^2=(40+1)^2

=(40)^2+2×40×1+1^2

=1600+80+1

=1681

4) 72^2= (70+2)^2

=70^2+2×70×2+2^2

=4900+280+4

=5180

5) 102^2=(100+2)^2

=100^2+2×100×2+2^2

=10000+400+4

=10404