Question

what is the product of the radical expression
(7-sqrt2)(8+sqrt2)
a. 13+15 sqrt 2
b. 54+56 sqrt 2
c. 54- sqrt 2
d was wrong

Answer 1

(7-sqrt2)(8+sqrt2) = 56 + 7 sqrt(2) - 8 sqrt(2) - 2 = 54 - sqrt(2)

Answer 2

so its b

Answer 3

C my bad

Answer 4

Yep

Answer 5

also do you know how to do this
sqrt 2+4 - sqrt x = 2

Answer 6

@Kira_Yamato

Answer 7

sqrt(2) + 4 - sqrt x = 2
sqrt(2) - sqrt(x) = -2
sqrt(x) = 2 + sqrt(2)
x = 6 + 4sqrt(2)

Answer 8

a.x=0 and x=-16
b.x=0 and x=16
c.x=0
d was wrong

Answer 9

I think c

Answer 10

Huh?

Answer 11

a.x=0 and x=-16
b.x=0 and x=16
c.x=0
d was wrong