Question

find value of polynomial 2x2+5x+1at x=3​

Answer 1

Answer:

For a quadratic equation, ax2+bx+c=0,

The sum of the roots=a−b and product of the roots is ac

Here sum of roots= α+β=2−5

Product of roots=αβ=21

Therefore,α+β+αβ=2−5+21

⇒ α+β+αβ=−2

Answer 2

Answer:

2*9+5*3+1

18+15+1

34

Step-by-step explanation:

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