Question

сократить дробь: x^2-25/x^2-3x-10

Answer 1

1)  x^2 - 3x - 10 = 0
x1 = -2
x2 = 5
x^2x - 3x - 10 = (x + 2)*(x - 5)
2)  x^2 - 25 = (x - 5)*(x + 5)
[(x - 5)*(x + 5)] / (x + 2)*(x - 5) = (x + 5) / (x + 2)