Teaching DSSSB TGT Mock Test 2025 Mathematics Relations and Functions

Let f ∶  R → R be defined by f(x) = x2 + 1. Then, pre-images of 17 and –3, respectively, are

1
ϕ, {4, – 4}
2
{3, – 3}, ϕ
3
{4, –4}, ϕ
4
{4, – 4, {2, – 2}
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