Question

HELLP

Answer 1

\[(\sqrt{5} -\sqrt{-4}) (\sqrt{35}-\sqrt{-28})\]

evaluate the expression in the form a+bi

Answer 2

i have an answer and work but its not correct i dont know what im doing wrong?

Answer 3

What did you get?

Answer 4

\[(\sqrt{175}+4\sqrt{7}) -(4\sqrt{35}) i \]

Answer 5

You need to simplify sqrt175

Answer 6

which before simplifying help by a "tutor" i got

Answer 7

\[\sqrt{175}-4i \sqrt{35}-4\sqrt{7}\]

Answer 8

5 sqrt 7 ?

Answer 9

\[(\sqrt{5}-2i)(\sqrt{35}-2\sqrt{7}i)=5\sqrt{7}-10\sqrt{35}i-2\sqrt{35}i+4\sqrt{7}i^2\]

Answer 10

Work on that.

Answer 11

wait... hold your train lol ... how did you get all those numbers?

Answer 12

Be more specific. What number in particular are you unclear about?

Answer 13

Well when you got -10 sqrt 35i why is the i on the inside ? because when foiling it was on the outside?

Answer 14

wait no hold on.. let me look at this for a minnute ...

Answer 15

\[\sqrt{175}=\sqrt{25(7)}=5\sqrt{7}\]

Answer 16

The i is not on the inside

Answer 17

okay so now tell me where did you come up with \[10\sqrt{35}\]

Answer 18

That's actually a mistake. Both the outer and inner should be -2sqrt35 (i)

Answer 19

ahhhh okaii ... makes sence now thats what i got ... so just a minnute while i keep calculating

Answer 20

\[-4\sqrt{35i}-\sqrt{7}\]