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If (f(x)=x^2-5x) and (g(x)=3x), what are the zeroes of ((f+g)(x))?

Answer and explanation

Correct answer: (0) and (2)

The direct answer is option A, 0 and 2. The sum function is found by adding corresponding values: \\( (f+g)(x)=f(x)+g(x)=(x^2-5x)+3x=x^2-2x\\). A zero is an input for which the function value is zero, so set \\(x^2-2x=0\\). Factor: \\(x(x-2)=0\\). By the zero-product property, either \\(x=0\\) or \\(x-2=0\\), giving \\(x=2\\). Hence the zeroes are 0 and 2, option A. Option B, 0 and 5, incorrectly uses the zero of the original f term without combining it with g. Option C, 2 and 5, misses the zero x=0. Option D, only 2, misses one valid solution. Always form the requested sum first; do not find zeroes of f or g separately. Checking gives \\(0^2-2(0)=0\\) and \\(2^2-2(2)=0\\).

Related tags

FunctionsZeroesQuadraticMedium

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