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factorise 5(3x+y)+6(3x+y)-8

Asked by Kriti Arora 14th September 2013, 1:31 PM
Answered by Expert
Answer:
The correct expression should be 5(3x + y)+ 6(3x + y) - 8. It can be factorised as follows:
 
Let (3x + y) = z. Then, the expression becomes:
5z+ 6z - 8
= 5z+ 10z - 4z - 8
= 5z(z + 2) - 4(z + 2)
= (z + 2)(5z - 4)
= (3x + y + 2) [5(3x + y) - 4]
= (3x + y + 2) (15x + 5y - 4)
Answered by Expert 14th September 2013, 9:23 PM
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