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Great video
Great question sir g ❤
❤❤❤❤❤❤
385 only has three factors, 5, 7, and 11, so one of the terms must be equal to 1. By trying 4, -8, -4, and 8, it follows that -4 is the solution, without having to solve a fourth-degree equation!
Let x = y - 1(y -4)(y+8)(y+4)(y-8) = 385(y^2 - 16)(y^2 - 64) = 385y^4 - 80 y^2 = - 639(y^2 - 40^)^2 = 961y^2 = 71 , 9y = - 3 , 3 , - √71 , √71x = - 4 , 2 , - 1 - √71 , - 1+√71
x={2,-4}.ans
Great video
Great question sir g ❤
❤❤❤❤❤❤
385 only has three factors, 5, 7, and 11, so one of the terms must be equal to 1. By trying 4, -8, -4, and 8, it follows that -4 is the solution, without having to solve a fourth-degree equation!
Let x = y - 1
(y -4)(y+8)(y+4)(y-8) = 385
(y^2 - 16)(y^2 - 64) = 385
y^4 - 80 y^2 = - 639
(y^2 - 40^)^2 = 961
y^2 = 71 , 9
y = - 3 , 3 , - √71 , √71
x = - 4 , 2 , - 1 - √71 , - 1+√71
x={2,-4}.ans