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How to factor quadratics?

I need to factor these and I don't remember how...some help please...

  1. 3x^2 +10xy -25y^2

  2. 3y^2 +y -16

Answers (3)

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  1. 3x^2+10xy-25y^2

3x^2+10xy-25y^2+25=25

(3x+2.5)(x+10y) + (y+ really odd question, and I was in advanced pre-calculus. the double variable and constant product is why i refuse to answer.

  1. 3y^2 +y -16

(3y+4)(y-4)= your answer... almost.... why is there a stray "y"? I want to know what bok you got this from.... so I can learn.