Factorise : 4c^2 + 3c - 10
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=4c^2+8c-5c-10
=4c(c+2)-5(c+2)
=(4c-5)(2+c)
c=5/4, c= -2
=4c(c+2)-5(c+2)
=(4c-5)(2+c)
c=5/4, c= -2
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hope this will help...
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