For f(1), substitute 1 in for x in the right-hand side of the equation:

f(1) = 2(1) + 7,

so f(1) = 3 + 7

so f(1) = 10.

For f(-2), substitute -2 in for x in the right-hand side of the equation:

f(-2) = 2(-2) + 7,

so f(-2) = -4 + 7,

so f(-2) = 3.

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