What is the value of x?

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units

The intercept theorem (Thales')
                 l
DY ║ FS  ⇒     DJ / FD = JY / SY

                         50 / x  =  42 / 63

                         x = (50 × 63) / 42

                         x = 3150 / 42

                         x = 75 units

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 *_*