quadratic equation

Question

Solve .
a.		c.
b.		d.

Answer 1

Hi Derek.

With out a "bx" term, simply move the 81 to the right

11 x² = -81

divide both sides by 11

x² = -81/11

square root both sides

x ±√(-81/11) = ±( √-1 )( √81 ) / √11

x = ± (i)(9)/ √11 = ± 9 i / √11 = ± (9/√11)i (c)