RyanLeung
RyanLeung RyanLeung
  • 24-04-2019
  • Mathematics
contestada

(a) Find f(1/2).
(b) Solve f(x) = 0.

a Find f12b Solve fx 0 class=

Respuesta :

mkryukova19 mkryukova19
  • 24-04-2019

Answer:

a) f(1/2)= - 4,  b)  f(x)=0 when x=-0.5, x=0.633,x= - 1.383

Step-by-step explanation:

f(x):(2x+1)=8x²+6x-7

f(x)=(2x+1)*(8x²+6x-7)

a) f(1/2)= (2*(1/2)+1)*(8*(1/2)²+6*(1/2)-7)=(1+1)(2+3-7)=2*-2= - 4

f(1/2)= - 4

b) f(x)=0

(2x+1)*(8x²+6x-7)=0

2x+1=0, x= - 1/2

8x²+6x-7=0

x=(-b+/-√(b^2-4ac))/2a

x=(-6+/-√(6²-4*8*(-7)))/2*8=(-6+/-√(260))/16

x=0.633 and x=-1.383

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