Factorise 6xy - 4y + 6 -9x by regrouping method. Please explain the regrouping of 6-9x to get the common factor 3x-2 as it is the same obtained in the 6xy -4y
Factorization by regrouping is quite easy.
In the term 6-9x, take out the highest common factor which is 3 and leave the rest inside a bracket.
Similarly, in the term 6xy-4y, take out the HCF which is 2y outside and keep the rest inside a bracket.
Now,put the terms together.
Change the sign of the first term to factorise further.