Question

Find the value of 'k' for which x²- kx +40=0 has
equal roots​

Answer 1

Answer:

4√10.

Step-by-step explanation:

explanation above

Answer 2

Answer:

if a quadratic equation in the form of ax^2+bx+c has equal roots then,

b^2-4ac=0

so,

((-k)^2) - 4 × 1 × 40 = 0

k^2 - 160 = 0

k^2 = 160

k = +√160 or -√160

= 4√10 or -4√10