Precal
posted by Dina on .
Given f(x) and g(x) below, find:
(a) f + g (b) f – g (c) f*g (d) f/g
Please show all of your work.
f(x) = x + 5
g(x) = 5x^2+15x3

just substitute f and g as needed
f(x) + g(x) = (x+5) + (5x^2 + 15x  3)
= 5x^2 + 16x + 2
f(x) + g(x) = (x+5)  (5x^2 + 15x  3)
= 5x^2  14x + 8
f(x) * g(x) = (x+5) * (5x^2 + 15x  3)
= 5x^3 + 20x^2 + 72x  15
f(x) + g(x) = (x+5) / (5x^2 + 15x  3) 
perils of copy/paste:
2nd and 4th lines should read f(x)g(x) and f(x)/g(x)