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Maths CBSE Live product
Class 8
We Distribute, Yet Things Multiply
Generalisation of increment in products
6.
TBQ - Expand and find the product
Question:
3
m.
Expand
a
−
u
b
+
v
and find the product of
25
\(\times\)
78
using the expansion.
Solution:
The correct expansion of
a
−
u
b
+
v
is.
a
−
u
b
+
v
=
ab
−
ub
+
av
−
uv
a
−
u
b
+
v
=
ab
−
ub
+
av
+
uv
a
−
u
b
+
v
=
ab
+
ub
+
av
−
uv
a
−
u
b
+
v
=
ab
−
ub
−
av
−
uv
The given product is expanded as
i
−
5
i
+
8
.
The final answer is
.
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