amareun amareun
  • 02-04-2018
  • Mathematics
contestada

Factor x2 + x – 42. x2 + x – 42 = x2 + – 42
= x( )– (x + 7) =

Respuesta :

penfila11Pen
penfila11Pen penfila11Pen
  • 03-04-2018
Hey there :)

x² + x - 42

The sum is 1
The product is - 42

Possibilities? 
[tex] \left \{ {{6(-7)=-42} \atop {6+(-7)=-1}} \right. [/tex]
This is wrong since the sum is not 1

[tex] \left \{ {{7(-6)=-42} \atop {7+(-6)=1}} \right. [/tex]
This is right

So the factored version will be:
( x + 7 )( x - 6 )
Answer Link

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