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For a polynomial p(x) of degree ge1, p(a...

For a polynomial `p(x)` of degree `ge1, p(a)=0` , where a is a real number, then `(x-a)` is a factor of the polynomial `p(x)`
`p(x)=x^(3)-3x^(2)+4x-12` , then `p(3)` is

A

`0`

B

`1`

C

`-1`

D

`2`

Text Solution

AI Generated Solution

The correct Answer is:
To find \( p(3) \) for the polynomial \( p(x) = x^3 - 3x^2 + 4x - 12 \), we will substitute \( x = 3 \) into the polynomial and simplify. ### Step-by-step Solution: 1. **Write down the polynomial**: \[ p(x) = x^3 - 3x^2 + 4x - 12 \] 2. **Substitute \( x = 3 \)**: \[ p(3) = 3^3 - 3(3^2) + 4(3) - 12 \] 3. **Calculate \( 3^3 \)**: \[ 3^3 = 27 \] 4. **Calculate \( 3(3^2) \)**: \[ 3^2 = 9 \quad \Rightarrow \quad 3(3^2) = 3 \times 9 = 27 \] 5. **Calculate \( 4(3) \)**: \[ 4(3) = 12 \] 6. **Substitute these values back into the polynomial**: \[ p(3) = 27 - 27 + 12 - 12 \] 7. **Simplify the expression**: \[ p(3) = 27 - 27 + 12 - 12 = 0 + 0 = 0 \] Thus, \( p(3) = 0 \). ### Final Answer: \[ p(3) = 0 \]
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Knowledge Check

  • For a polynomial p(x) of degree ge1, p(a)=0 , where a is a real number, then (x-a) is a factor of the polynomial p(x) For what value of k, the polynomial 2x^(4)+3x^(3)+2kx^(2)+3x+6 is exactly divisible by (x+2) ?

    A
    `0`
    B
    `-1`
    C
    `1`
    D
    `2`
  • For a polynomial p(x) of degree ge1, p(a)=0 , where a is a real number, then (x-a) is a factor of the polynomial p(x) Find the value of k if x-1 is a factor of 4x^(3)+3x^(2)-4x+k .

    A
    `0`
    B
    `1`
    C
    `-3`
    D
    `2`
  • For the polynomial p(x)=x^(5)+4x^(3)-5x^(2)+x-1 , one of the factors is

    A
    `(x+1)`
    B
    `(x-1)`
    C
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    D
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