Given that a is a root of the equation x2-x-1 = 0, find the value of A2 − a (A2 − a) 2 − 1 + 3
By substituting x = a into the equation: a2-a-1 = 0, that is, a2-a = 1, then the original formula = 11 − 1 + 3 = 33
Given that a is a root of the equation x2-x-1 = 0, find the value of A2 − a (A2 − a) 2 − 1 + 3
By substituting x = a into the equation: a2-a-1 = 0, that is, a2-a = 1, then the original formula = 11 − 1 + 3 = 33
3 (x-2y) - 2 (3x + 5Y) =?
6-7x-19y