HP 39gs

E
E
x
x
p
p
a
a
n
n
d
d
i
i
n
n
g
g
p
p
o
o
l
l
y
y
n
n
o
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m
m
i
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a
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l
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s
s
Expand the expressions below.
4
(i)
(
2x + 3
)
5
(ii)
(
3a − 2b
)
(i) Use
POLYFORM((2X+3)^4,X) to expand the polynomial.
Use the
key to examine the result.
3
Result:
16x
4
+ 96 x + 216x
2
+ 216x + 81
(ii) Use
POLYFORM((3A-2B)^5,B) to expand the polynomial
as a function of
B. Then use the polynomial function again,
ing the result from the first expansion and expanding
this time as a function of
A. The key can then be
used to view it, using the left and right arrows to scroll the
screen left and right.
4 32 23 5
Result:
243a
5
− 810a b + 1080a b − 720a b + 240ab
4
− 32b
304