Question

If the discriminant of the quadratic equation kx2-30x+25=0 is 0, then k=…….

Answer 1

Answer:

$k \: \: = 9$

Step-by-step explanation:

$discriminant \: for \: a {x}^{2} + bx \: + c \: = 0 \: \: is \: \: {b}^{2} - 4ac$

${b}^{2} \: - 4ac \: = 0 \: \: (given)$

$therefore \: {( - 30)}^{2} - 4 \times k \times 25 = 0$

=

$900 = 100k$

$k \: = \: 9$

Hence, the answer.