Can someone me figure out all my khan academy questions i can't figure out anything and i always learn better when i get the answer but i don't want to keep getting it wrong because my grade will go down.

Its  the first option 
-3(1)+8 = 5
-3(2) + 8 = -2
-3(75) + 8 = --217

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*