Question

If 1 is the zero of the polynomial x square plus kx-5

​

Answer 1

Answer: 4

Step-by-step explanation:

Given that 1 is the zero of quadratic polynomial x^2 + kx - 5, it means that the value of x is 1 and on applying the value of x( i.e. 1 ) result of the given polynomial will be 0.

Given equation : x^2 + kx - 5

Substitute the value of x in the quadratic polynomial.

⇒ ( 1 )^2 + ( 1 × k ) - 5 = 0

⇒ 1 + k - 5 = 0

⇒ k - 5 + 1 = 0

⇒ k - 4 = 0

⇒ k - 4 + 4 = 4

⇒ k = 4

Therefore the value of k satisfying the given quadratic polynomial is 4.