The function f is defined for all numbers x by $$f(x)=x^{2}+x$$.

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The function f is defined for all numbers x by $$f(x)=x^{2}+x$$. If t is a number such that f(2t) = 30, which two of the following could be the number t?

Indicate two such numbers.

A、-5
B、-3
C、$$-\frac{1}{2}$$
D、2
E、$$\frac{5}{2}$$

答案：B,E

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