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Haylee Ford
Mathematics
18 October, 20:52
Find the domain and range of y=x^ (2) + 8x+17.
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Mariela Mcfarland
18 October, 21:07
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The domain is all real values of x.
This is the equation of a parabola which opens upwards and has a minimum value. To find this minimum value we need to convert to vertex form.
x^2 + 8x + 17
= (x + 4) ^2 - 16 + 17
= (x + 4) ^2 + 1
Minimum value is 1
Range is y > = 1 or [1, ∞) in interval form.
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