If f={(1,2),(-3,2),(2,5)} and g={(2,4),(1,5),(3,2)}.find:

Question

a)f+g and f-g
b)the domain of (f+g)

Answer 1

the domain of f+g is D(f) ∩ D(g) = {1,2}

For other values, both f and g are not defined, so f+g cannot be defined.

f+g = {(1,2+5),(2,5+5)} = {(1,7),(2,10)}

do f-g the same way.

Answer 2

Good

Answer 3

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Answer 4

If the intersection of f+g is 1 and 2 son the f+g is 3