Answer:
x = 5
Step-by-step explanation:
the expression is "undefined" when the denominator is equal to zero
denominator = 25 - x²
Values of x where the equation is "undefined"
0 = 25 - x²
x² = 25
√x² = √25
x = ± 5
Nonnegative value of x where the equation is "undefined"
x = 5
A(b+c) = ab + ac
8(x+y) = 8x + 8y
Answer:
b
Step-by-step explanation:
Answer:
sqrt(2h/g) = t
Step-by-step explanation:
h=1/2gt^2
We want to get t alone
First multiply by 2 to get rid of the fractions
2*h=2*1/2gt^2
2h = g t^2
Then divide by g on each side
2h/g = g t^2/g
2h/g = t^2
Then we need to take the square root of each side
sqrt(2h/g) = sqrt(t^2)
Normally we take the ± sqrt, but since time must be positive ( cannot have negative time)
sqrt(2h/g) = t
Analyze perfect cubes:
1^3 = 1
2^3 = 8
3^3 = 27
Since 12 is between 8 and 27, cube root of 12 is between 2 and 3.
You also know it is much closer to 2, since 12 is much closer to 8.
A good guess would be 2.25
(2.25)^3 = 11.39
This is close but slightly less than 12.
When you use your calculator you should get 2.2894.