Question

Multimea solutiei ecuatiei: 4x²+8x=-4 .

Answer 1

4x²+8x+4=0  |:4
x²+2x+1=0
a=1
b=2
c=1
Δ=b²-4ac
Δ=4-4
Δ=0⇒ ec. are o singura solutie reala
x1=x2=-b/2a
x1=x2=-2/2
x1=x2=-1
x∈{-1}