find HCF of 9x^3-49y^2 and (3x+7y)^2-84x^2
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(3x+7y)^2-84x^2 it is the right answer
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Answer:
This question is wrong. The 1st expression should be 9x^2-49y^2 and second expression should be (3x+7y)^2 -84xy.
If you don't correct it, then HCF is 1. If you correct it, then do as follows:
(9x^2-49y^2)=(3x+7y)(3x-7y)
(3x+7y)^2-84xy=9x2+49y^2+42xy-84xy=9x^2+49y^2-42xy
=(3x-7y)^2
So HCF of two expressions is 3x-7y
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