Question

iff(x) = 4x3 + 3x2 - 5x + 20 and g(x) = 9x2 - 4x2 + 10x - 55, what is (g- f)(x)?13x3 - x2 + 5x - 355x3 + x2 + 5x + 35Ο Α- 5x3 + 7x2 - 15x + 755x3 - 7x2 + 15x - 75

Answer 1

the functions are:

$\begin{gathered} f(x)=4x^3+3x^2-5x+20 \\ g(x)=9x^3-4x^2+10x-55 \end{gathered}$

Fo the rest will be:

$(g-f)(x)=(9x^3-4x^2+10x-55)-(4x^3+3x^2-5x+20)$

now we operate:

$\begin{gathered} 9x^3-4x^3-4x^2-3x^2+10x+5x-55-20 \\ 5x^3-7x^2+15x-75 \end{gathered}$

So is option D