Question

if 5 is a zero of quadratic polynomial x square minus kx minus 15 then the value of k is

1)2
2) -2
3)4
4)-4​

Answer 1

$\huge\boxed{\fcolorbox{cyan}{Red}{Solution:-}}$.

➡Given equations .

↪x²-kx -15=0.............(1).

▶If x= 5, is factor of this equations so,..

✔X = 5 , exits this equations .

↪(5)²-5k-15=0.

↪5k= 25-15.

↪5k= 10.

↪k= 2.

➡Hopes its helps u.

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Answer 2

Answer:

2

Step-by-step explanation:

k=2 because put x =5 so the value is 2