What is the domain and range of $y = x^2 - 7$ ?

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Answer 1 · 2016-06-05T11:35:05

Domain is R, set of real numbers and Range is the set of real numbers greater or equal than -7

Domain is R, set of real numbers

Range is the domain of inverse function

$x=+-sqrt(y+7)$

it must be
$y+7>=0$
$y>=-7$

Therefore Range is the set of real numbers greater or equal than -7

What is the domain and range of y = x^2 - 7 y = x^2 - 7?