Question

Factorise 4x^2-16x-9
please answer step by step​

Answer 1

Step-by-step explanation:

For a polynomial of the form

ax^2+bx+c

, rewrite the middle term as a sum of two terms whose product is

a*c=4*−9=−36

and whose sum is b=−16

4x^2+2x−18x−9

2x(2x+2) -9(2x+1)

(2x-9) (2x+1)

Answer 2

Answer:

To factorise – 4x²-16x-9

How to solve – By splitting middle term

Solution –

4x²-16x-9

= 4x² -18x +2x -9

= 2x (2x - 9) +1 (2x - 9)

= (2x + 1) (2x -9)