Question 615944
{{{4x^2+5=-67}}} subtract 5
{{{4x^2=-72}}} divide by 4
{{{x^2=-18}}} take the sqrt of each side
{{{sqrt(x^2)= sqrt(-18)}}}
{{{x= 3sqrt(-2)}}}
when taking the square root of something it has a plus or minus before it
+{{{3sqrt(-2)}}}
-{{{3sqrt(-2)}}}