factorise the following
3b2 + bc + 15ab +5ac
ax- ay -3az+2bx-2by -6bz
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3b2+bc+15ab+5ac
Taking b and 5a as common
b (3b+c) 5a (3b+c)
(b+5a) (3b+c )
b+5a=0 3b+c=0
b=-5a 3b=-c
or b=-c/3
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