(g + f)(-1/2)
= 2(-1/2) + -2(-1/2)³ + 5(-1/2)
= -1 - 2(1/8) - 2 1/2
= -1 - 1/4 - 2 1/2
= -3 1/4
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(g + f)(-1/2)
= 2(-1/2) + -2(-1/2)³ + 5(-1/2)
= -1 - 2(1/8) - 2 1/2
= -1 - 1/4 - 2 1/2
= -3 1/4