Factor 15x^2-17x-18

Question

Factor 15x^2-17x-18

anonymous · Answer

15x^2-27x+10x-18=0
take 3x as common in first two terms and 2 as common in next two terms
3x(5x-9)+2(5x-9)=0
(3x+2)(5x-9)=0
by using the priciple of zero products
3x+2=0   or   5x-9=0
3x=-2       or       5x=9
  x=-2/3    or        x=9/5

zzr0ck3r · Answer

the first thing you wanted to do was multiply 15* -18 and then find two numbers that multiply to get this number and add to get the middle coefficient i.e. as @AmmuluRajesh  found we get those numbers as -27, and 10

anonymous · Answer

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