An exponential decay function represents a quantity that has a decreasing halving time. true or false?

False.

The exponential decay can be expressed in any variable. In fact, a quantity is subject to exponential decay if it decreases at a rate proportional to its current value. In this way, we can write the exponential decay model as follows:

So, an example of an exponential decay is shown in the Figure below. See that . The of this function is 1 as you can see.

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