(e+2)^2 + 2e (5e -2) = e^2 + 4e + 4 + 10e^2 - 4e = 11e^2 + 4 = 11 * 2 +4 = 26
(x+y)^2 + 2x (3x - y) = x^2 + 2xy + y^2 + 6x^2 -2xy = 7x^2 + y^2 = 7 + 2 = 9
c(5c+6) - (c+3)^2 = 5c^2 + 6c - c^2 - 6c - 9 = 4c^2 - 9 = 59
y(5y + 2x) - (x+y)^2 = 5y^2 + 2xy - x^2 - 2xy - y^2 = 4y^2 - x^2 = 1
6ae + 3(a - e)^2 = 6ae + 3a^2 - 6ae +3e^2 = 3a^2 + 3e^2 = 15
((a^2-e^2)/2a^2) * a/(2a-2e) = ((a - e)(a + e)/2a^2) * a/2(a-e) = (a+e)/2a * 1/2 =
(a+e)/4a = 1/4 + e/4a = 1/4 + sqrt(98)/sqrt(32) = 1/4 + 7/4 = 8/4 = 2