Answer:
see explanation
Explanation:
3
(f + g)(x)
= f(x) + g(x)
= 2x² - 4x - 5 + 3x - 13 ← collect like terms
= 2x² - x - 18
4
(f - g)(x)
= f(x) - g(x)
= 2x² - 4x - 5 - (3x - 13) ← distribute parenthesis by - 1
= 2x² - 4x - 5 - 3x + 13 ← collect like terms
= 2x² - 7x + 8