Question

Dadas las funciones f(x)=6x+5 y g(x)=7 - 8x, encuentra
3) (f+g) (x)

4) (f-g)(x)

5) (fg)(x)
​

Answer 1

Explicación paso a paso:

f(×)=6x +5 y g(×)=7-8x

Hallamos:

( f + g )(x) = f (x) + g (x)

( f + g )(x) = 6x+5 +7-8x

( f + g )(x) = -2x+12

( f – g )(x) = f (x) – g (x)

( f – g )(x) = 6x+5 – (7-8x)

( f – g )(x) = 6x+5 – 7+8x

( f – g )(x) = 14x-2

( fg )(x) = f (x) × g (x)

( fg )(x) =(6x+5) × (7-8x)

( fg )(x) = 42x - 48x² +35 - 40x

( fg )(x) = -48x²+2x +35