If(2x+3y) directly proportional to (x+5y) or x is directly proportional to y, then which one of following is true. A. x/y=(5k-3/2-k). B. x:y=(5k-3):2-k. C. x=y(5k-3/2-k). D. all

c

Step-by-step explanation:

A,B,D cant be it

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

answerim :

n

step-by-step explanation:

im not sure but my dad knows