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WAEC Further Mathematics 2015 Paper
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© africaexams.com
Question : 12
Total: 40
Find the minimum value of
y
=
x
2
+
6
x
−
12
.
-21
-12
-6
-3
Validate
Solution:
y
=
x
2
+
6
x
−
12
d
y
d
x
=
2
x
+
6
=
0
2
x
=
−
6
implies
x
=
−
3
y
(
−
3
)
=
(
−
3
)
2
+
6
(
−
3
)
−
12
=
9
−
18
−
12
=
−
21
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