Question

- X² + 8 x - 7 = 0
∆=
X½ =______=
X¹= ______=
X²_____=

Answer 1

/\=b^2-4.a.c
/\=8^2-4.(-1).(-7)
/\=64-28
/\=36

x1/2=-b+-"raiz" /\ / 2.a
x1/2=-8+-"raiz" 36 /2.(-1)
x1/2=-8+-6/-2

x1=-8+6/-2
x1=-2/-2
x1=1

x2=-8-6/-2
x2=-14/-2
x2=7