Question

X2+ 1 = 9

Question 1 options:


A. X = 16


B. X = 20


C. X = 4


D. X = 5

Answer 1

X = 4

Explanation:

x2 + 1 = 9

We have to cross 1 over to the other side so that x becomes a value on its own. Because we are it over, the addition sign changes to subtraction which makes the expression,

x2 = 9- 1

x2 = 8

For x to stand alone we have to divide both sides by 2

x 2/2 = x

and 8/2 = 4

Therefore x=4 (Answer)