Question

evaluate using suitable identity 90 square -10 square​

Answer 1

Answer:

1.90×90= 8100 2.-10×-10=100

Answer 2

Step-by-step explanation:

(90)²-(10)²

= (90+10) (90-10)

= 100×80

= 8000

Algebraic identities used:

1. a²-b² = (a+b) (a-b)