( g + h )(t)= g(t) + h(t)
( g + h )(t) = t^2 + 5t - 4t - 1
( g + h )(t) = t^2 + t - 1
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( g + h )(8) = 8^2 - 8 - 1
( g + h )(8) = 64 - 8 - 1
( g + h )(8) = 56 - 1
( g + h )(8) = 55
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