11. Find the product of 4x’y, -2xyz and 5y.
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Answer:
Given that (4x+5y)(4x+5y)
But we can write the given expression as (4x+5y)(4x+5y)=(4x+5y)
2
And we have (a+b)
2
=a
2
+2ab+b
2
On applying above identity in the given expression we get,
(4x+5y)
2
=(4x)
2
+2(4x)(5y)+(5y)
2
∴(4x+5y)
2
=16x
2
+40xy+25y
2
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