How do you solve y24y21=0 using the quadratic formula?

1 Answer

x1=7
x2=3

Explanation:

So basically the quadratic equation is x=b±b24ac2a
Here x=y,a=1,b=4,c=21
Plug that in and we get:
x=(4)±4241(21)21

x=4±16+842

x=4±1002

x=4±102

x=2±5

There are two possible values for x.
x1=7
x2=3