x²+20x-1500=0
x₁,₂=(-20±√400+6000)/2
x₁,₂=(-20±√6400)/2
x₁,₂=(-20±80)/2
x₁= -100/2= -50
x₂=60/2=30
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x²+20x-1500=0
x₁,₂=(-20±√400+6000)/2
x₁,₂=(-20±√6400)/2
x₁,₂=(-20±80)/2
x₁= -100/2= -50
x₂=60/2=30