Question

POLYNOMIALS
3. If the zeroes of the polynomial x3 – 3x2 + x + 1 are a - b, a, a +b, find a and b.

Answer 1

Step-by-step explanation:

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rajeevgupta39

Secondary SchoolMath 5+3 pts

If the zeroes of polynomial x³-3x²+x+1 are (a-b),a, (a+b), find a and b.

Report by Parvd 27.05.2017

Answers

SachinKrMb

SachinKrMb Brainly Top Contributor

Answer:

→ a = 1 and b = ±√2 .

Step-by-step explanation:

Given polynomial is f(x) = x³ - 3x² + x + 1 .

Here a = 1 , b = -3 , c = 1 , d = 1 .

Let α = ( a - b ) , β = a and γ = ( a + b ) .

As we know,

→ α + β + γ = -b/a .

⇒ ( a - b ) + a + ( a - b ) = -(-3)/1 .

⇒ 3a = 3 .

⇒ a = 3/3 .

∴ a = 1 .

And,

→ αβ + βγ + γα = c/a .

⇒ a( a - b ) + a( a + b ) + ( a + b )( a - b ) = 1/1 .

⇒ a² - ab + a² + ab + a² - b² = 1 .

⇒ 3a² - b² = 1 .

⇒ ( 3 × 1² ) - b² = 1 . { ∵ a = 1 }

⇒ 3 - b² = 1 .

⇒ b² = 3 - 1 .

⇒ b² = 2 .

∴ b = ±√2 .

Hence, it is solved .

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