Question

7. Factorise: x2 - 11x - 42
8. Factorise: 12(2x - 3y)? - 16(3y -- 2x)
9. The population of a city was 120000 in a year 2013. During next year it inc
due to an epidemic it decreased by 5% in the following year. What was its​

Answer 1

Answer:

1. -3, 14

Step-by-step explanation:

1. x^2 - 11x -42 = x^2 -14x+3x -42

= x (x-14) + 3(x-14)

= (X+3)(x-14)

hence, X = -3 and x = 14