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\[(x-7)(x-8)\]
+
−
.
ln
>
<
×
÷
/
log
≥
≤
(
)
log
x
=
%
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"(x+1)/2+4=7"
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expand((x-7)(x-8))
expand (x-7)(x-8)
(x-7)(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
−
7
x
+
56
{x}^{2}-8x-7x+56
x
2
−
8
x
−
7
x
+
5
6
2
Collect like terms.
x
2
+
(
−
8
x
−
7
x
)
+
56
{x}^{2}+(-8x-7x)+56
x
2
+
(
−
8
x
−
7
x
)
+
5
6
3
Simplify.
x
2
−
15
x
+
56
{x}^{2}-15x+56
x
2
−
1
5
x
+
5
6
Done
x^2-15*x+56
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