SOLUTION: 4x^2y+20xy-92y says to factor?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 4x^2y+20xy-92y says to factor?      Log On


   

Question 190388: 4x^2y+20xy-92y
says to factor?
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
4x^2y+20xy-92y
4y(x^2+5x-23)
Using the quadratic equationx+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ we get:
x=(-5+-sqrt[5^2-4*1*-23])/2*1
x=(-5+-sqrt[25+92])2
x=(-5+-sqrt117)/2
x=(-5+-10.82)/2
x=(-5+10.82)/2
x=5.82/2
x=2.9
x=(-5-10.82)/2
x=-15.82/2
x=-7.91
4y(x+7.91)(x-2.9) ans.