Question

Find the value of k is 9x^2-30x+k is a perfect square

Answer 1

ANSWER=

If 9x^2-30x+k is a perfect square then k=??

Look we know the condition of a perfect square,

              which tells us that d=b^2-4ac=0

Step-by-step explanation:

∴here we have a=9 b=-30 c=k

Now simple!,

Just put the values in the given formula of discriminant,

(-30)^2-4(9)(k)=0

We get 900-36k=0

            36k=900

             k=25

Hence, we get the answer as k=25.............

thank you

Answer 2

Answer:

25

Step-by-step explanation:

(a+b+c)2=a2+b2+c2 2(ab+bc+ca)

this is formula for this sum