jimmyhendrick jimmyhendrick
  • 22-08-2019
  • Mathematics
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Factored version of y^2-2y-15

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Аноним Аноним
  • 22-08-2019

Answer: (y-5)(y+3)

// If the coefficient of the y^2 is 1 and equation has integer-solution, than 15 must be divisible to that solution. Fermat's Theorem consequence

It's obvious that y=5 is solution.

// If x1 and x2 are solution to quadratic equation, ay^2+bx+c, where a is 1, then x1*x2=c. Fermat's Theorem

Divide equation by (y-5), If you cannot do this look for other obvious solutions.

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