Check the following expressions are polynomial 1/x_2+1/X_1 +7

please answer me friends

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!