The range of the function f(k) = k^2 + 2k + 1 is {25, 64}. What is the function’s domain?
1 answer:
<span>k^2 + 2k + 1 = 25
</span><span>k^2 + 2k + 1 - 25 = 0
</span><span>k^2 + 2k - 24 = 0
(k - 4)(k + 6) = 0
k - 4 = 0; k = 4
k + 6 = 0; k = -6
</span>k^2 + 2k + 1 = 64
k^2 + 2k + 1 - 64 = 0
k^2 + 2k - 63 = 0
(k - 7)(k + 9) = 0
k - 7 = 0; k = 7
k + 9 = 0; k = -9
x = -9, -6, 4, 7
answer
<span>D. {4, 7}</span>
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