Question

for what value of k ,is 3 a zero af the polynomial 2x^2+x+k​

Answer 1

Answer:

K=-21 is the answer for the given polynomial

Answer 2

ANSWER:

• Value of k is (-21).

GIVEN:

• 3 is the zero of the polynomial P(x) = 2x²+x+k

TO FIND:

• Value of 'k'.

SOLUTION:

=> P(x) = 2x²+x+k

Here, 3 is the zero of the given polynomial P(x). so if we put x = 3 then we get the remainder = 0.

=> P(x) = 2x²+x+k

=> 2(3)²+3+k = 0

=> 18+3+k = 0

=> k = (-21)

Value of k is (-21).

NOTE:

Some important formulas:

(a+b)² = a²+b²+2ab

(a-b)² = a²+b²-2ab

(a+b)(a-b) = a²-b²

(a+b)³ = a³+b³+3ab(a+b)

(a-b)³ = a³-b³-3ab(a-b)

a³+b³ = (a+b)(a²+b²-ab)

a³-b³ = (a-b)(a²+b²+ab)

(a+b)² = (a-b)²+4ab

(a-b)² = (a+b)²-4ab