Hezkizel Hezkizel
  • 19-03-2017
  • Mathematics
contestada

factor X squared minus 2x minus 24

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irspow
irspow irspow
  • 19-03-2017
ax^2+bx+c. To factor you are looking for two values, j and k, which satisfy to conditions:

ac=jk and b=j+k.  We have:

x^2-2x-24 so in this case j=-6 and k=4

Now you replace the single linear term (the bx one) with two linear terms (jx and kx) into the original expression:

x^2-6x+4x-24  now you can factor the first and second pair of terms...

x(x-6)+4(x-6) which is equal to:

(x+4)(x-6)
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