How do you factor #x= y^2-21y-63 #?
1 Answer
Jul 30, 2016
can't be factored
Explanation:
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.
