Answers

2015-06-28T17:14:12+05:30
(a+b)²=(1+8)²=9²=81.
Also:
(a+b)²=a²+2ab+b²
⇒1²+2*1*8+8²
=1+16+64
=81.
Ans:81
1 5 1
Please click on the yellow button below my ans
2015-06-28T19:25:32+05:30
Here a=1 and b=8.
(a+b)²=a²+2ab+b²
(1+8)²=1²+2×1×8+8²
⇒1+16+64
=81
One more short method:
(1+8)
²
=9²
=81
0