Question

What will be the pre image of 4 in the function f(x) = √x ( root under x)

Answer 1

Answer:

For pre image of 17 we have:

f(x)=x

2

+1=17

⇒x

2

+1=17

⇒x

2

=16

⇒x=

16

⇒x=±4

So, x∈{−4,4}

For pre image of −3 we have:

f(x)=x

2

+1=−3

⇒x

2

+1=−3

⇒x

2

=−4 (NOT possible)

Hennce, no possible pre image.

So, x∈ϕ

Step-by-step explanation:

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