Question

Solve the quadratic equation.

0 = x2 + 2x + 1
1
1
b
a
[?]
-b + b24ac
Remember the quadratic formula: x =
2a

Answer 1

This is the answer using the formula

Answer 2

product =1 and sum =2

then look for two no whose product and sum give the digits above.

it's (1 and 1)

then x2+x+x+1=0

factorising it gives

x(x+1)+1(x+1)=0

(x+1)(x+1)=0

then x=-1