Question

If f is defined by fx= x^+1then find preimage of 17 and-3

Answer 1

Step-by-step explanation:

$f(x) = {x}^{2} + 1 \\ = > y = {x}^{2} + 1 \\ = > x = \sqrt{y - 1} \\ given \: f(x) = y = 17 \:and \: - 3 \\ putting \: the \: \: values \: in \: the \: above \: eq \\ x = preimage = \sqrt{17 - 1 } = \sqrt{16} = +-4 \\ x = \sqrt{ - 3 - 1} = \sqrt{ - 4} = 2i$hope it helps ......