Question

What is the nature of the roots of the quadratic equation $x^2 - 5x + 7 = 0$ ?

• A. Not real
• B. Real, rational, equal
• C. Real, irrational, unequal
• D. Real, rational, unequal

Answer 1

Answer:

A. Not real

$=b^2-4ac$

$=-5^2-4\times 1\times7$

$=25-28=-3$

this is negative so the roots are not real