If x2 - 5x + 1 = 0 Find (x2 - 11) (x2 - 12)

156 131 181 132

131

Given, x2 - 5x + 1 = 0 x2 = 5x - 1    ---------------(1) put the value of x2  in  below equation  = (x2 - 11) (x2 - 12) = (5x - 1 - 11) ( 5x - 1 - 12) = (5x - 12) (5x - 13) = 25x2 - 125x + 156 25(x2 - 5x) + 156 ⇒ x2 - 5x = -1  from equation (1) -25 + 156 = 131