Solving Quadratic Equations using Quadratic Formula
If
a
x
2
+
b
x
+
c
= 0, then
x
=
-b
±
b
2
-
4ac
2a
So, if
x
2
-
11
x
+
30
= 0, then
x
=
-
(
-11
)
±
(
-11
)
2
-
(
4
)
(
1
)
(
30
)
(
2
)
(
1
)
or,
x
=
11
±
121
-
120
2
or,
x
=
11
±
1
2
or,
x
=
11
±
1
2
or,
x
=
12
2
or,
x
=
10
2
or,
x
=
6
or,
x
=
5
Algebra
Analytic Geometry
Differential Calculus
Integral Calculus
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)