Question

find the value of k that would make the left side of the equation a perfect square trinomial:
x^2+kx+25=0

Answer 1

Ok let me see

Answer 2

Do you have choices?

Answer 3

no

Answer 4

I would say K will equal 30

Answer 5

can you explain it? :)

Answer 6

Ok wait up

Answer 7

Take the square root of the first and last terms.....

3x and 5

Multiply those together.....

15x

Double that answer and that is what your middle term needs to be if you are going after a perfect square trinomial. (Your given polynomial already has the "x" part so you are only looking for the 30.) I had the same question so this is what i put

Answer 8

x^2+kx+25=0
see the expanding of (x + 5)^2 = x^2 + 10x + 25
now just identicaly with the equation above, you will see the value of k there