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Find the values of p for which the equation x2 − 3x + 1 = p(x−3) has equal roots.

Mathematics

ScanSolve AI Answer

Answer

1, 5

Step-by-step solution

4 steps
  1. Rearrange the given equation into the standard quadratic form ax2+bx+c=0ax^2 + bx + c = 0.

    The given equation is x2−3x+1=p(x−3)x^2 - 3x + 1 = p(x-3).
    Expand the right side:

    x2−3x+1=px−3px^2 - 3x + 1 = px - 3p

    Move all terms to the left side:

    x2−3x−px+1+3p=0x^2 - 3x - px + 1 + 3p = 0

    Factor out xx:

    x2+(−3−p)x+(1+3p)=0x^2 + (-3 - p)x + (1 + 3p) = 0
  2. Identify the coefficients aa, bb, and cc.

    From the standard quadratic form ax2+bx+c=0ax^2 + bx + c = 0, we have:

    a=1a = 1 b=−3−pb = -3 - p c=1+3pc = 1 + 3p
  3. Apply the condition for equal roots.

    For an equation to have equal roots, the discriminant (Δ\Delta) must be zero. The discriminant is given by the formula Δ=b2−4ac\Delta = b^2 - 4ac.
    Set the discriminant to zero:

    b2−4ac=0b^2 - 4ac = 0

    Substitute the values of aa, bb, and cc:

    (−3−p)2−4(1)(1+3p)=0(-3 - p)^2 - 4(1)(1 + 3p) = 0
  4. Solve the equation for pp.

    Simplify the equation:

    (p+3)2−4(1+3p)=0(p + 3)^2 - 4(1 + 3p) = 0 p2+6p+9−4−12p=0p^2 + 6p + 9 - 4 - 12p = 0

    Combine like terms:

    p2−6p+5=0p^2 - 6p + 5 = 0

    Factor the quadratic equation:

    (p−1)(p−5)=0(p - 1)(p - 5) = 0

    Set each factor to zero to find the possible values of pp:

    p−1=0  ⟹  p=1p - 1 = 0 \implies p = 1 p−5=0  ⟹  p=5p - 5 = 0 \implies p = 5

    The possible values of pp are 1,5\boxed{1, 5}.

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