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(
x
+
9
)
(
x
−
8
)
(x+9)(x-8)
(
x
+
9
)
(
x
−
8
)
+
−
.
ln
>
<
×
÷
/
log
≥
≤
(
)
log
x
=
%
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"(x+1)/2+4=7"
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expand((x+9)(x-8))
expand (x+9)(x-8)
(x+9)(x-8)
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
−
8
x
+
9
x
−
72
{x}^{2}-8x+9x-72
x
2
−
8
x
+
9
x
−
7
2
2
Collect like terms.
x
2
+
(
−
8
x
+
9
x
)
−
72
{x}^{2}+(-8x+9x)-72
x
2
+
(
−
8
x
+
9
x
)
−
7
2
3
Simplify.
x
2
+
x
−
72
{x}^{2}+x-72
x
2
+
x
−
7
2
Done
x^2+x-72
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