Question

if one root of the eqaution 2x²-ax+5=0 is 2 then a is?​

Answer 1

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Answer 2

Answer:

a= -7......

Step-by-step explanation:

Given : If one root of the equation 2x^2+ax+6=02x

2

+ax+6=0 is 2.

To find : The value of a ?

Solution :

If 2 is the root of the quadratic equation then it satisfy the equation.

Equation 2x^2+ax+6=02x

2

+ax+6=0

Substitute x=2 in the equation,

2(2)^2+a(2)+6=02(2)

2

+a(2)+6=0

8+2a+6=08+2a+6=0

2a+14=02a+14=0

2a=-142a=−14

a=-\frac{14}{2}a=−

2

14

a=-7a=−7

Therefore, the value of a is -7.

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