If (x² − 3x + 2) is a factor of (x⁴ − Px² + Q) then what are the values of P…
2024
If (x² − 3x + 2) is a factor of (x⁴ − Px² + Q) then what are the values of P and Q respectively?
- A.
5, 4
- B.
−5, 4
- C.
5, −4
- D.
More than one of the above
- E.
None of the above
Attempted by 13 students.
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Correct answer: A
Step-by-Step Solution
Given that (x² − 3x + 2) is a factor of (x⁴ − Px² + Q), the roots of the quadratic factor must also be roots of the quartic polynomial.
First, find the roots of (x² − 3x + 2) = 0.
Factorize: (x − 1)(x − 2) = 0
The roots are x = 1 and x = 2.
Substitute x = 1 into the polynomial (x⁴ − Px² + Q) = 0:
1⁴ − P(1)² + Q = 0
1 − P + Q = 0 => P − Q = 1 (Equation 1)
Substitute x = 2 into the polynomial (x⁴ − Px² + Q) = 0:
2⁴ − P(2)² + Q = 0
16 − 4P + Q = 0 => 4P − Q = 16 (Equation 2)
Solve the system of equations:
Subtract Equation 1 from Equation 2:
(4P − Q) − (P − Q) = 16 − 1
3P = 15 => P = 5
Substitute P = 5 into Equation 1:
5 − Q = 1 => Q = 4
Thus, the values are P = 5 and Q = 4.
हिन्दी समाधान
दिया गया है कि (x² − 3x + 2), (x⁴ − Px² + Q) का एक गुणनखंड है। इसलिए, द्विघात समीकरण के मूल चतुर्घात बहुपद के भी मूल होंगे।
सबसे पहले, (x² − 3x + 2) = 0 के मूल ज्ञात करें:
गुणनखंडन: (x − 1)(x − 2) = 0
मूल x = 1 और x = 2 हैं।
x = 1 को बहुपद में रखने पर:
1 − P + Q = 0 => P − Q = 1 (समीकरण 1)
x = 2 को बहुपद में रखने पर:
16 − 4P + Q = 0 => 4P − Q = 16 (समीकरण 2)
समीकरण 2 में से समीकरण 1 को घटाने पर:
3P = 15 => P = 5
P = 5 को समीकरण 1 में रखने पर:
5 − Q = 1 => Q = 4
अतः, P = 5 और Q = 4 हैं।
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