How do you express a ratio

Step-by-step explanation:

One way to write a ratio is as a fraction:

Example:

Another way is by writing it using the word "to," as "9 to 6."

The most common way or the one you will see the most is the using a colon between the two numbers, 9 : 6.

Now let me be clear that all three of these ways are actually saying the EXACT SAME THING!!!

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