Question

Sabendo que a soma das raízes da equação x^2-(2p-4).x+32=0 é 12, calcule p

Answer 1

   x² - (2p-4)x +32=0  

  calculando os sinais >>>>> x²+(-2p+4)x+32 =0 

  a=1      b= -2p+4       c=32

s= r+r'  --------------> s= -b/a    -------------> 12 = -(-2p+4)

                                                                   12=+2p-4

                                                                    12+4=2p

                                                                     p=16/2

                                                                     p= 8

resp: p = 8