If the equation 3x2+bx+8=0 has roots 1 and 83, then what is the value of b?
A
5
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B
−11
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C
−5
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D
11
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Solution
The correct option is B−11 Given equation is 3x2+bx+8=0
The roots are 1 and 83
In a quadratic equation ax2+bx+c=0 if the roots are 1 and ca
then the sum of coefficients must be zero. ⇒a+b+c=0
So here, 3+b+8=0 ⇒b=−11