Question

find83×87 using suitable identity​

Answer 1

Answer:

7539

Step-by-step explanation:

(90+7)×(80+7)

=7²+(90+80)7+90×80

=49+170×7+6300

=49+1190+6300

=7539

Answer 2

Step-by-step explanation:

$83 \times 87$

$= (80 + 3)(80 + 7) \\ = (80)^{2} + (3 + 7)80 + {(3 \times 7)}\\ = 6400 + 800 + 21\\ = 7221$