Question

s^2 +6s+4=0 then s=?

Answer 1

s² + 6s + 4 = 0
comparing above equation with ax² + bx + c = 0,we get
a = 1 , b = 6, c = 4
D = b² - 4ac
D = 6² - 4*1*4
D = 36 - 16
D = 20
so, s = -b +- √D/2a
s = -6 +- √20/2*1
s = -6 +- 2√5/2
s = -6+2√5/2 , -6-2√5/2
s = 2(-3+√5)/2 , 2(-3-√5)/2
s = -3 + √5 , -3 - √5