Question

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

Answer 1

Answer:

7.5

Step-by-step explanation:

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

Answer 2

Step-by-step explanation:

${x}^{2} - 15 = 0 \\ \\ \therefore \: {x}^{2} = 15 \\ \\ \therefore \: x = \pm \sqrt{15} \\ \\ \therefore \: x = \sqrt{15} \: \: or \: \: x = - \sqrt{15} \\ \\ \therefore \: x = \{ - \sqrt{15}, \: \: \sqrt{15} \}$

henc, there are two real solutions.