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B
38,32
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C
0,83
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D
83,52
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Solution
The correct option is D83,52 Here the quadratic equation is , 6x2+40=31x ⇒6x2−31x+40=0 ⇒6x2−16x−15x+40x=0 ⇒2x(3x−8)−5(3x−8) ⇒(3x−8)(2x−5) ⇒3x−8=0 ⇒3x=8 ⇒x=83 or ⇒2x−5=0 ⇒2x=5 ⇒x=52