Flag 10 grade maths> 21. If one root of the quadratic equation...
question mark

21. If one root of the quadratic equation 2x² + kx – 6 = 0 is 2, the value of k is(a) 1(b) -1(c) 2(d) -2

Harshit Singh , 3 Years ago
Grade 12th pass
anser 1 Answers
Pawan Prajapati

Last Activity: 3 Years ago

Answer: b Explaination:Reason: Scice x = 2 is a root of the equation 2x² + kx -6 = 0 ∴ 2(2)² +k(2) – 6 = 0 ⇒ 8 + 2k – 6 = 0 ⇒ 2k = -2 ∴ k = -1

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...