Question

. If one zero of the quadratic polynomial x² + 3x + k is 2, then the value of k is *


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Answer 1

Step-by-step explanation:

put x=2

than we get

4+3+k=0

k=-7

Answer 2

Given :

• If one zero of the quadratic polynomial x² + 3x + k is 2

To find :

• the value of k

Solution :

Let the given quadratic polynomial be P(x)

It is given that one of its zeros is 2

==> P(2) = 0

==> (2)² + 3(2) + k = 0

==> 4 + 6 + k = 0

==> k + 10 = 0

==> k = - 10

Extra formula's :

• C.S.A of cube = 4a²

• T.S.A of cube = 6a²

• Volume of cube = a³

• Volume of sphere = 4/3πr³

• Surface area of sphere = 4πr²

• Volume of Hemisphere = ⅔ πr³

• C.S.A of hemisphere = 2πr²

• T.S.A of hemisphere = 3πr²