Question

Find the number of real number solutions for the question.
x^2-15=0

Answer 1

Explanation:

`{x}^(2) - 15 = 0 \\ \\ \therefore \: {x}^(2) = 15 \\ \\ \therefore \: x = \pm √(15) \\ \\ \therefore \: x = √(15) \: \: or \: \: x = - √(15) \\ \\ \therefore \: x = \{ - √(15), \: \: √(15) \} \\`

henc, there are two real solutions.

Answer 2

7.5

Explanation:

you are trying to figure out what the equation equals so what times two equals 15? 7.5 and 15-15 equals 0