do you mean by "find" right? not fing?
My Answer:
Solution :
x
=
3
+
2
√
7
,
x
=
3
−
2
√
7
Explanation:
Comparing with general equation
a
x
2+
b
=
0 x
2
−
6
x
−
19
=
0
; =
1
,
b
=
−
6
,
c
=
−
19
. Discriminant D
=
b
2
−
4
⋅
a
⋅
c
=
36
+
76
=
112
is positive so roots are real.
Quadratic formula for finding roots is
x = −
b
2
a
±
√
b
2
−
4
a
c
2 a or x
=
− 6
2
±
√
112 2 or x
=
3
±
4
⋅
√
7
2 or x
=
3
±
2
⋅
√
7
=
Solution :
x
=
3
+
2
√
7
,
x
=
3
−
2
√
7
