Answers edited by Eivind K.
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How do you simplify
(
6
)
(
3
x
−
y
)
−
(
4
)
(
2
x
+
y
)
?
What are the extrema of
f
(
x
)
=
(
x
−
4
)
(
x
−
5
)
on
[
4
,
5
]
?
How do you simplify
(
10
1
3
)
1
2
?
How do you solve y = 2x + 9 and 2x - y = -9?