Question

me ajudem formula de bascara equaçao do 2 grau
7x²+14x+2+2-2x²+7x=

Answer 1

-2x²+7x²+14x+7x+2+2=
5x²+21x+4
a=5
b=21
c=4
^=(b)² -4.a.c
^=(21)² -4.5.4
^=441-216
^=225

x=-b +- raiz de ^/2.a
x=-21 +-15/2.5


x1=-21-15/10
x1=-36/10= -3,6

x2=-21+15/10= -6/10= -0,6