Question

Factorise 15x^2 -2x-1

Answer 1

15X²-2x-1=0
a=15 b =-2c=-1
ac =-15
b°-2
using splitting middle term

15X²-2x-1
15x²-5x+3x-1
take common
=5x(3x-1)-(3x-1)
so= (5x-1) (3x-1)=0
5x-1=0
=>5x=1
=>x=1/5

for 3x-1
3x=1
x=1/3

hope it helps

@sonu

Answer 2

Answer:

15X²-2x-1=0

a=15 b =-2c=-1

ac =-15

b°-2

using middle term  splitting  

15X²-2x-1

15x²-5x+3x-1

take common

=5x(3x-1)-(3x-1)

so= (5x-1) (3x-1)=0

5x-1=0

=>5x=1

=>x=1/5

for 3x-1

3x=1

x=1/3