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Let a and b be the roots of the quadratic equation 2x210x+5=0.What is the value of (2a3)(4b6)?

 Jun 11, 2024
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Expanding the desired expression, we get (2a3)(4b6)=8ab12a12b+18=8ab12(a+b)+18. This implies that we need the sum and product of the roots of the given equation, which are 10/2=5 and 5/2, respectively. Thus, the desired expression equals (852)(125)+18=22.

 Jun 11, 2024

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