Question

what's did I do wrong? The correct answer is 9120 but mine isn't.​

Answer 1

Answer:

yes answer is 9120

Step-by-step explanation:

you went wrong in 4th step

here is how it goes

90²+(5+6)90 + (5*6)

= 8100 + (11)90 + 30

= 8100 + 990 + 30

= 9120

Answer 2

Answer:

9120

Step-by-step explanation:

( 90 + 5 ) ( 90 + 6 )

= 90 square + ( 5 × 6 )× 90 + ( 5 × 6 )

= 8100 + ( 11 × 90 ) + 30

= 8100 + 990 + 30

= 9090 + 30

= 9120

I hope this answer helps you ☺.