Question

91 square find using identies​

Answer 1

Answer:

8281

Step-by-step explanation:

91 square =( 90+1)square

we know

a plus b whole square equals a square plus b sqare plus 2ab

therefore,

8100+1+180

8281

Answer 2

Answer:

methods of finding square easily

formula = ( a + b ) *2

it is a + b ka whole square

for example

91 square = ( 90 + 1 ) *2

90 *2 + 1* + 2* 90 * 1

8100 + 1 + 181

8282

this is the square of 9q