Question

please simplify step by step (8+i)(2+7i)

Answer 1

we just cross multiply. to get 16+56i+2i+7i^2. then we just combine like terms to get 16+58i+7i^2

Answer 2

i thought so too but its wrong..

Answer 3

the answer is 56i+9 but idk how.

Answer 4

no that answer is wrong.

Answer 5

i checked on mathway

Answer 6

\[j ^{2}=-1 \therefore (8+j)(2+j7) = 16+j56+j2-7 = j58-9\]