Question

If 5 is a zero of the quadratic polynomial x2-kx-15 then the value of k
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Answer 1

The value of k = 2

Step-by-step explanation:

Given,

5 is a zero of the quadratic polynomial $x^2-kx-15$

To find, the value of k = ?

∴ $x^2-kx-15=0$       ......(1)

Put x = 5 in (1), we get

$5^2-k(5)-15=0$

⇒ $25-5k-15=0$

⇒ $10-5k=0$

⇒ 5k = 10

⇒ $k=\dfrac{10}{5}$

⇒ k = 2

∴ The value of k = 2

Hence, the value of k = 2

Answer 2

here is answer

value of k=2