Factorise 49a²– 81b²
Answers
Answered by
0
Answer:
You may notice that
49
=
7
2
and
81
=
9
2
are both squares.
Explanation:
So
49
a
2
=
(
7
a
)
2
and
81
b
2
=
(
9
b
)
2
are also squares, and then we can use the special product of the form:
x
2
−
y
2
=
(
x
+
y
)
(
x
−
y
)
=
(
7
a
+
9
b
)
(
7
a
−
9
b
)
Answered by
1
Step-by-step explanation:
( 7a + 9b ) . ( 7a - 9b )
Difference of 2 perfect squares can be factorised into ( A + B ) . ( A - B )
Attachments:
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