Question

Diketahui : f(x)=5^2-2x
g(x)=x^4+3x^2-2
carilah : a) f(x)-g(x)
b) f(x)+g(x)
c) f(x) x g(x)

Answer 1

F(x) = 5² - 2x = 25 - 2x dan g(x) = x^4 + 3x² - 2
a. f(x) - g(x) = 25 - 2x - (x^4 + 3x² - 2) = -x^4 - 3x² - 2x + 27
b. f(x) + g(x) = 25 - 2x + x^4 + 3x² - 2  = x^4 + 3x² - 2x + 23
c. f(x)g(x) = (25-2x)(x^4+3x²-2)
                = 25x^4 + 75x² - 50 -2x^5 - 6x³ + 4x
                = -2x^5 + 25x^4 - 6x³ + 75x² + 4x - 50