Question

A function ‘f ’ is defined by f(x)=x^2 +3 , x belongs to N and x <=5 find x when f(x) = 7

pls tell the right answer only and not anything else . pls tell me it is urgent

Answer 1

Step-by-step explanation:

According to Question,

${x}^{2} + 3 = 7 \\ = > {x}^{2} + 3 - 7 = 0 \\ = > {x}^{2} - 4 = 0 \\ = > {x}^{2} - {2}^{2} = 0 \\ = > (x - 2)(x + 2) = 0 \\ = > x = 2 \: or \: - 2$

From given conditions, i.e.

x<= 5

x = 2 or -2 both value are acceptable.