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\[(x-0.2)(x+0.4)\]
+
−
.
ln
>
<
×
÷
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log
≥
≤
(
)
log
x
=
%
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expand((x-0.2)(x+0.4))
expand (x-0.2)(x+0.4)
(x-0.2)(x+0.4)
1
Use the FOIL method:
(
a
+
b
)
(
c
+
d
)
=
a
c
+
a
d
+
b
c
+
b
d
(a+b)(c+d)=ac+ad+bc+bd
(
a
+
b
)
(
c
+
d
)
=
a
c
+
a
d
+
b
c
+
b
d
.
x
2
+
0.4
x
−
0.2
x
−
0.08
{x}^{2}+0.4x-0.2x-0.08
x
2
+
0
.
4
x
−
0
.
2
x
−
0
.
0
8
2
Collect like terms.
x
2
+
(
0.4
x
−
0.2
x
)
−
0.08
{x}^{2}+(0.4x-0.2x)-0.08
x
2
+
(
0
.
4
x
−
0
.
2
x
)
−
0
.
0
8
3
Simplify.
x
2
+
0.2
x
−
0.08
{x}^{2}+0.2x-0.08
x
2
+
0
.
2
x
−
0
.
0
8
Done
x^2+0.2*x-0.08
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