x+y=5, x+4y=4, what is the value of 4x2+16y2?

x+y=5, x+4y=4, what is the value of 4x2+16y2? ?

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দেওয়া আছে, x + y = 5 x + 4y = 4 .:. 4x² + 20xy + 16y² = 4x² + 4xy + 16xy + 16y² = 4x(x + y) + 16y(x + y) = (x + y) (4x + 16y) = 4(x + y)(x + 4y) = 4.5.4 = 80

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