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How to factor 7x^2+27xy-4y^2​

 Jul 23, 2020
 #1
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7x^2+27xy-4y^2​

 

7*-4=-28

I need to numbers that add to 27 and mult to -28     

They are 28 and -1

 

 

\(7x^2+28xy-1xy-4y^2​\\ =7x(x+4y)-y(x+4y)\\ =(7x-y)(x+4y)\)

 Jul 23, 2020

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