Which of the following equations has only one solution?
x(x - 1) = 9
x2 - 6x + 9 = 0
x²=9

x2 - 6x + 9 = 0

Step-by-step explanation:

Factorize the equation: take 9 and split it into its factors 3 and 3.

After factorization, determine the signs by looking at the middle term. Since it's negative, the greater factor will be negative while the other will be positive. However, here it doesn't make a difference because both numbers are 3.

We're left with this

(x-3) (x-3) = 0

x-3=0 and x-3=0

By adding 3 to both sides in the first equation, we find out that x=3

The same also happens with the second equation, so x=3 as well.

Since both answers are the same, they are one solution.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

i you goofed up when writing this, because hnot is not a word minusf is not either. i cannot answer   because of that.

step-by-step explanation: