Question

Factorise 15x2 + 2x – 1
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Answer 1

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