How do you factor $x= y^2-21y-63$ ?

Question

1431 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-07-30T21:57:12

can't be factored

f(y) = y^2 - 21y - 63
D = b^2 - 4ac = 441 + 252 = 693.
Since D is not a perfect square, f(y) can't be factored.

How do you factor x= y^2-21y-63 x= y^2-21y-63 ?