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Δ=b ²- 4ac
x1= -b- √ Δ / 2a
x2= -b+ √Δ / 2a
a) a²-12a+11=0
Δ=12 ²- 4*1*11
Δ=144- 44
Δ=100
√Δ=10
a1= 12- 10 / 2
a1= 2 / 2
a1= 1
a2=12+ 10 / 2
a2=22 / 2
a2=11
b) 3p ²+12p+9=0
Δ=12 ²- 4*3*9
Δ=144- 108
Δ=36
√Δ=6
a1= -12-6 / 6
a1= -18 /6
a1= -3
a2=-12+ 6 / 6
a2=-6/6
a2=-1
d)-3x²+5x+2=0
Δ=5 ²- 4*(-3)*2
Δ=25+24
Δ=49
√Δ=7
a1= -5-7 / -6
a1= -12 /-6
a1= 2
a2=-5+ 7 /- 6
a2=2/-6
a2=-1/3
e) 4x²+x-3=0
Δ=1 ²- 4*(-3)*4
Δ=1+48
Δ=49
√Δ=7
a1= -1-7 / 8
a1= -8 /8
a1= -1
a2=-1+ 7 /8
a2=6/8
a2=3/4
f)6x ² +5x+6=0
Δ=5 ²- 4*(6)*6
Δ=25-144
Δ<0
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g) -4k²-16k +9=0
Δ=16 ²- 4*(-4)*9
Δ=256+144
Δ=400
√Δ=20
a1= 16-20 / -8
a1= -4 /-8
a1= 1/2
a2=16+20 /-8
a2=36/-8
a2=-4,5
h) 4x² =20x+9=0
Δ=20 ²- 4*(9)*4
Δ=400-144
Δ=256
√Δ=16
a1= -20-16 / 8
a1= -36 /8
a1= -4,5
a2=-20+ 16 /8
a2=-4/8
a2=-1/2
i) -9x²+ 4x+5=0
Δ=4 ²- 4*(-9)*5
Δ=16+180
Δ=196
√Δ=14
a1= -4-14/ -18
a1= -18 /-18
a1= 1
a2=-4+ 14 /-18
a2=10/-18
a2=-5/9