Q.
The quadratic equations x2−6x+a=0 and x2−cx+6=0 have one root α in common. The other roots of the first and second equations are integers in the ratio 4: 3. Then equation x2−3x−4=0 has
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a
both roots more than α
b
both roots less than α
c
one root more than α and other less than α
d
Can't say anything
answer is C.
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Detailed Solution
Let equation x2−6x+a=0 have roots α and βAlso, let equation x2−cx+6=0 have roots α and γGiven βγ=43 ⇒αβαγ=43 ⇒a6=43 ⇒a=8First equation is x2−6x+8=0⇒ (x−2)(x−4)=0⇒ x=2,4If β=4, then γ=3β4=3If β=2, then γ=3β4=32, which is not an integer.Now, x2−3x−4=0⇒ (x−4)(x+1)=0⇒ x=−1,4Clearly, one root is less than 2 and other is more than2
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