Question

which of the following equation has 2 as a root? the answer is 3x^2-6x-2=0



plz send me the solution

dont send another type solution if u know correcly then send me plz​

Answer 1

3x²-6x-2 = 0

now..put the value of x = 2

=> 3(2)²-6×2-2 = 0

=> 3×4 - 12-2 = 0

=> 12-14 = 0

=> -2 = 0

since the LHS ≠ RHS

so 3 is not a root of equation 3x²-6x-2 = 0

Answer 2

Solve the following equations by using the general formula, if the equation has a solution in R :

(1)x

2

+6x+5=0

(2)x

2

−3x−4=0

(3)5x

2

+8x+3=0

(4)5x

2

−3x−2=0

(5)3x

2

+5

2

x−2=0

(6)x

2

+5x+3=0

(7)9x

2

+6x+4=0

(8)48m

2

−13m−1=0

Solve the following equations by using the general formula, if the equation has a solution in R :

(1)x

2

+6x+5=0

(2)x

2

−3x−4=0

(3)5x

2

+8x+3=0

(4)5x

2

−3x−2=0

(5)3x

2

+5

2

x−2=0

(6)x

2

+5x+3=0

(7)9x

2

+6x+4=0

(8)48m

2

−13m−1=0