Question

7.If one zero of the quadratic polynomial x² + 3x + b is 2, then the value of b is
a 10
b -8
c 9
d -10​

Answer 1

Answer:

if one zero of the colder polygon answer is I saw a10

c 9

Answer 2

Given : One zero of the quadratic polynomial x² + 3x + b is 2

To find : Value of b

Solution :

Before solving the given problem, we must know what the zero of an equation actually is !

The value at which the graph of the given equation crosses x axis is called the zero of the equation.

or

The value of x at which the given equation becomes 0 is called the zero of the equation.

We are given that 2 is a zero of the given quadratic polynomial.

=> p(x) = x² + 3x + b

=> p(2) = (2)² + 3(2) + b

=> 0 = 4 + 6 + b

=> 0 = 10 + b

=> -10 = b

So the required value of b is -10.

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