How to graph straight lines using intercepts

U graph a straight line using internet with a ruler

You use rise over run and plot the number from the y intercept

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 *_*