Question

factorise 15ab + 5a + 3b + 1​

Answer 1

Answer:

15a +5a+3a+1=0

5a(3+1)+a(3+1)

(5a+a)(3+1)

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Answer 2

Answer:

=15ab+5a+3b+1

=5a(3b+1)+(3b+1)

(5a+1)(3b+1)=0

a=-1/5

b=-1/3