if f(x)= -2x - 3 and g(x)=x^2+5x, find the value of f(r+2)
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f(x) = -2x - 3
f(r+2) = -2(r+2) - 3 = -2r - 4 - 3 = -2r - 7
f(r+2) = -2(r+2) - 3 = -2r - 4 - 3 = -2r - 7
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