7x2−4x−5=0
7x2−4x+5=0
7x2+4x−5=0
7x2+4x+5=0
Correct answer is B
Let the roots of the equation be α and β.
α+β=−ba=47
αβ=ca=57
⟹a=7,b=−4,c=5
Equation: ax2+bx+c=0
= 7x2−4x+5=0
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