(5+√3)(5-√3)

- 16
- 22
- 25 + 10√3
- 16 + 10√3

B. 22

Step-by-step explanation:

Simplify the radical by breaking the radicand up into a product of known factors.

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15