10. Solve by using identity (2x-5y)?
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Answer:
4x^2 + 25y^2 - 20 xy
Step-by-step explanation:
(2x-5y)^2
using identity -
( a-b) ^2 = a^2 + b^2 - 2ab
(2x)^2 + (5y)^2 - 2(2x)(5y)
4x^2 + 25y^2 - 20 xy
hope it helps
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