Question

If 2x-y=9 and xy=20 find 4x^2+y^2

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

{2x-y}^2 = 4x^2 + y^2 - 4xy

9^2 = 4x^2 +y^2 - 4×20

81 = 4x^2 + y^2 - 80

4x^2 + y^2 = 161.