Question

If 4x^2 + kx + 25 = 0 has exactly one solution, what could be the value of k?

Answer 1

Quadratic formula:
\[\sqrt{b^2-4ac}\] has to equal 0
b^2=4ac
b^2=400
b=20

Answer 2

thanks, but how do you find what a and c are?

Answer 3

wait i figured it out! Thanks so much!!