Question

check whether minus 3 is a solution of the equation 3 X square + 5 x + 2 is equals to zero

Answer 1

3x2+2kx−3=0  

Solutions are,

x=−2k±4k2+4∗3∗3√2∗3

x=−k±k2+9√3

Since it is given that x=−12,

−k±k2+9√3=−12

−k±k2+9−−−−−√=−32

k2+9=(k−32)2=k2−3k+94

3k=94−9

k=−94

Answer 2

Step-by-step explanation:

3x2+2kx_3=0 solutions are

x=2k+4k2+》*3^2

since it is given that x=12

_k +k2+9------------^=_32

k2 +9 =(k_32)2=k2_3k+94

3k=94_9

k=_94