Question

If a and b are zeros of polynomial P(x) =x^2-5x+6, then find the value of a+b -3ab.

Answer 1

a and b are zeroes of x^2-5x+6

a=1,b=-5,c=6

multiplication of roots=c/a

ab=6/1=6

addition=-b/a= -(-5)/1

=5

a+b-3ab=5-3(6)=5-18=-13

ans=-13

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Answer 2

Answer:

a+b-3ab = 11

Step-by-step explanation:

p(x) = x^2 -5x + 6

zeros if p(x) = a and b

In p(x)

ax^2 -bx+c = x^2-5x+6

that implies,

a=1. b=(-5). c=6.

a+b-3ab= 1+(-5)-3(1)(-5)

= 1-5+15

= 1+10

= 11

therfore,

a+b-3ab= 11