Question 124219
a quadratic (ax^2+bx+c) is a "perfect" square if (b^2)/4a=c


subtract 13 to clear the c value __ x^2+8x=-13


add (b^2)/4a __ x^2+8x+16=3 __ (x+4)^2=3


take sqrt __ x+4=ħsqrt(3)


subtract 4 __ x=-4ħsqrt(3)