What is x^2 -y^2? B) x * y = 12 So y = 12 / x A) x^2 + (12/x)^2 = 80 x^2 + (12/x)^2 = 80 x^2 + (144/x^2) = 80 Multiplying each side by x^2 x^4 + 144 = 80x^2 x^4 -80x^2 + 144 = 0 X = 1.355 (found by trial and error) Y =
8.85608 (found by trial and error)
