Question

2x la patrat -5x-12=0​

Answer 1

a=2, b=-5, c=-12

Δ=b²-4ac

Δ=(-5)²-4*2*(-12)

Δ=25+96

Δ=121

x1=(-b+√Δ)/2a=(5+11)/2*2=16/4=4

x2=(-b+√Δ)/2a=(5-11)/2*2=-6/4=-3/2

S={-3/2, 4}