а)(x-5)^2 - x^-2 = 3(x-5)^2 - 1/x^2 = 3(x^2 - 10x + 25) - 1/x^2 = 3x^2 - 10x + 25 - 1/x^2 = 3Multiply by x^2 to get rid of the fraction:x^4 - 10x^3 + 25x^2 - 1 = 3x^2x^4 - 10x^3 + 25x^2 - 1 - 3x^2 = 0x^4 - 10x^3 + 22x^2 - 1 = 0
б)(2y+1)^2 - 4y^2 = 5(2y + 1)^2 - 4y^2 = 54y^2 + 4y + 1 - 4y^2 = 54y + 1 = 54y = 4y = 1/4
а)
(x-5)^2 - x^-2 = 3
(x-5)^2 - 1/x^2 = 3
(x^2 - 10x + 25) - 1/x^2 = 3
x^2 - 10x + 25 - 1/x^2 = 3
Multiply by x^2 to get rid of the fraction:
x^4 - 10x^3 + 25x^2 - 1 = 3x^2
x^4 - 10x^3 + 25x^2 - 1 - 3x^2 = 0
x^4 - 10x^3 + 22x^2 - 1 = 0
б)
(2y+1)^2 - 4y^2 = 5
(2y + 1)^2 - 4y^2 = 5
4y^2 + 4y + 1 - 4y^2 = 5
4y + 1 = 5
4y = 4
y = 1/4