Answer:
x = ± [tex]\sqrt{7}[/tex]
Step-by-step explanation:
To find the zeros equate the polynomial to zero, that is
x² - 7 = 0 ( add 7 to both sides )
x² = 7 ( take the square root of both sides )
x = ± [tex]\sqrt{7}[/tex]
Thus the exact solutions are
x = - [tex]\sqrt{7}[/tex] , x = [tex]\sqrt{7}[/tex]
