Question
If x=23 is a solution of the quadratic equation 7x2+mx−3=0, find the value of m.
Answer: Option C
:
C
Given: x=23 is a solution of the quadratic equation 7x2+mx−3=0.
Substitutingx=23 in the given quadratic equation we get
⇒ 7(23)2+m(23)−3=0
⇒ 7(49)+m(23)−3=0
⇒ 289+2m3−3=0
⇒ 28+6m−27=0
⇒ m=−16
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:
C
Given: x=23 is a solution of the quadratic equation 7x2+mx−3=0.
Substitutingx=23 in the given quadratic equation we get
⇒ 7(23)2+m(23)−3=0
⇒ 7(49)+m(23)−3=0
⇒ 289+2m3−3=0
⇒ 28+6m−27=0
⇒ m=−16
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