Question

which term should be added to 25xsquare +49ysquare so that the sum will be a perfect square(choose two correct alternative) 1) 35xy 2)-70xy 3)70xy 4)-35xy​

Answer 1

Solution :

25x² + 49y²

= (5x)² + (7y)²

i ) ( 5x )² + (7y)² + 2*5x*7y

= (5x)² + (7y)²+70xy

= ( 5x + 7y )² ---( 1 )

ii ) ( 5x )² + (7y)² - 2*5x*7y

= (5x)² + (7y)²-70xy

= ( 5x - 7y )² ---( 2 )

Option ( 2 ) and ( 3 ) are

correct.

••••

Answer 2

Step-by-step explanation:

hope that was helpful thank you