Question

x2 – 16x + 15 = 0

Answer 1

x = 1 and 15.

Answer 2

a) x = 1, x = 15
b) x = 3, x = 5
c) x = -3, x = -5
d) x = -1, x = -15

Answer 3

x^2 - 16x = -15
x^2 - 16x + 15 = 0
x^2 - x - 15x + 15 = 0
(x^2 - x) - (15x - 15) = 0
x(x - 1) - 15(x - 1) = 0
(x - 1)(x - 15) = 0

x - 1 = 0
x = 1

x - 15 = 0
x = 15

∴ x = 1 , 15