Finding Zeroes of a polynomial

Chapter 2 Class 9 Polynomials
Concept wise  This video is only available for Teachoo black users   This video is only available for Teachoo black users   This video is only available for Teachoo black users  If  p(a) = 0

Then x = a is the zero of polynomial

So, to find zero,

We put p(x) = 0

And then find the value of x

Example :

p(x) = x + 30

Putting p(x) = 0

x + 30 = 0

x =   –30

So, x = −30 is a zero of polynomial p(x)

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### Transcript

How to find zeroes of polynomial? For polynomial p(x) , If p(a) = 0 Then x = a is the zero of polynomial So, to find zero, We put p(x) = 0 And then find the value of x An Example Find zero of polynomial p(x) = x + 30 Given p(x) = x + 30 Putting p(x) = 0 x + 30 = 0 x = −30 So, x = −30 is a zero of polynomial p(x) One more… Find zeros of polynomial p(x) = x2 − 9 Given p(x) = x2 −9 Putting p(x) = 0 x2 − 9 = 0 x2 = 9 x = ±3 So, x = 3, −3 are the zeros of polynomial p(x) Important Points Important Points Some important points about polynomials A constant polynomial doesn’t have any zeros A polynomial can have equal roots Example – x2 − 2x + 1 has equal roots Number of zeros of Polynomial is less than equal to its Degree 