Question

Solve using factorisation method:
21x^2-8x-4=0

Answer 1

Answer:

= (7x+2) (3x-2)

Step-by-step explanation:

$=21x^2 - 8x-4 \\=21x^2 - 14x+6x-4\\=7x(3x-2) + 2(3x-2)\\= (7x+2) (3x-2)$

Answer 2

Answer:

2/3      -2/7

Step-by-step explanation:

21x^2-14x+6x-4=0

7x(3x-2)+2(3x-2)=0

(7x+2)(3x-2)=0

x=2/3 , -2/7