Class 10 Exam > Class 10 Questions > Solve for x : 6x2+ 40 = 31xa)b)c)0,8/3d)None ...
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Solve for x : 6x2 + 40 = 31x
- a)
- b)
- c)0,8/3
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
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Solve for x : 6x2+ 40 = 31xa)b)c)0,8/3d)None of the aboveCorrect answe...
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Solve for x : 6x2+ 40 = 31xa)b)c)0,8/3d)None of the aboveCorrect answe...
6x²-31x+40=0,
a=6,
b=-31,
c=40,
by quadratic formula-->
x=-b±√b²-4ac/2a,
by putting the values of a,b and c, we get,
x=-(-31)±√(-31)²-4(6)(40)/2(6),
=31±√961-960/12,
=31±√1/12,
=31±1/12,
x=30/12or ,32/12,
x=5/2 or, 8/3,
hence , option B is correct
a=6,
b=-31,
c=40,
by quadratic formula-->
x=-b±√b²-4ac/2a,
by putting the values of a,b and c, we get,
x=-(-31)±√(-31)²-4(6)(40)/2(6),
=31±√961-960/12,
=31±√1/12,
=31±1/12,
x=30/12or ,32/12,
x=5/2 or, 8/3,
hence , option B is correct
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