Question

(radical7 +radical2)x(radical7 -3radical2)

Answer 1

\[(\sqrt 7 + \sqrt 2) \times (\sqrt 7 - 3\sqrt 2)\]

Answer 2

yes

Answer 3

use FOIL..just like your usual algebra thingies

Answer 4

Distribute (or FOIL as some call it).

Example:
\[\sqrt{3}*\sqrt{3}=\sqrt{9}=3\]

Answer 5

\[2\sqrt{5}*\sqrt{45}=2\sqrt{225}=2*15=30\]

Answer 6

i nenver learned how to multiply with radicals o.O

Answer 7

It's just like I explained above.

Answer 8

(a + b)(c - d)
= (a)(c) - (a)(d) + (b)(c) - (b)(d)

Answer 9

\[a=\sqrt{7}{\space}{\space}{\space}b=\sqrt{2}{\space}{\space}{\space}c=\sqrt{7}{\space}{\space}{\space}d=3\sqrt{2}\]

Answer 10

EDIT: d = \[-3\sqrt{2}\]