Question

What is the factored form of the polynomial? (z2 10z + 25)

Answer 1

I'm sure on A
Answer: A 
I'm just sure on that one 

Answer 2

Solution-

As the question is not complete so contemplating all the possible scenarios,

1st - z² + 10z + 25

2nd - z² - 10z + 25

For,

$z^2 + 10z + 25 = (z)^2+2.z.5+(5)^2 = (z+5)^2=(z+5)(z+5)$

And for,

$z^2 - 10z + 25 = (z)^2-2.z.5+(5)^2 = (z-5)^2=(z-5)(z-5)$

So, the factored form of the polynomials are,

$(z+5)(z+5) \ and \ (z-5)(z-5)$