Math Help - Find the values that give the function only one solution

1. Find the values that give the function only one solution

For which values of the constant d does the function x^2+(d-1)x+d have only one solution? State an exact answer. Thank you in advance!

2. Originally Posted by Anna55
For which values of the constant d does the function x^2+(d-1)x+d have only one solution? State an exact answer. Thank you in advance!
What value(s) of $d$ make the discriminant zero.
You know: $b^2-4ac=0$

3. I do not understand. Don't I need to know the value of a and c to make the discriminant equal zero?

4. $b^2-4ac$ refers to the notation used in the standard quadratic form which is $ax^2+bx+c=0$

For you $a = 1$ and $b= d-1$ and $c = d$