Question

f alpha and beta are the zeros of xsq+2x+8 then the value of (alpha+beta) is

Answer 1

Answer:

20

Step-by-step explanation:

We all know that,

                    Quadratic polynomials / Equations represent sum and product of their roots as S and P in the equation in form of x^2 - 2x + P = 0.

Therefore, here, in polynomial x^2 - 2x - 8

Sum of roots = 2

Product of roots = - 8

Here,

⇒ α^2 + β^2

⇒ α^2 + β^2 + 2αβ - 2αβ

⇒ ( α + β )^2 - 2αβ            { using a^2 + b^2 + 2ab = ( a + b )^2}

⇒ ( sum of roots )^2 - 2( product of roots )

⇒ ( 2 )^2 - 2( - 8 )

⇒ 4 - 2( - 8 )

⇒ 4 + 16

⇒ 20

Answer 2

Answer:

i can tell the real ans is 20 now do it your self don't cheat