Q 4 Using suitable identity find (7x - 3y)²?.
Answers
Answered by
1
Answer:
We know (a+b)
2
=a
2
+2ab+b
2
By using this identity, we get
(7x+3y)
2
=(7x)
2
+(3y)
2
+2×7x×3y
=49x
2
+9y
2
+42xy
This is the required answer.
Answered by
0
Answer:
we know that ( a-b ) ² = a²+b²-2ab
so (7x-3y) ²
14x²+9y²-21xy answer
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