Limₓ₋₂ (x²+5x-14)/(x-2)=limₓ₋₂ (x-2)(x+7))/(x-2) = limₓ₋₂ (x+7)=2+7=9
x²+5x-14=(x-2)(x+7)
D=25+56=81
x12=(-5+-9)/2=-7 2
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limₓ₋₇ (x²-4x-21)/(x-7)=limₓ₋₇ (x-7)(x+3)/(x-7)=limₓ₋₇ (x+3) = 7+3 = 10
x²-4x-21=(x-7)(x+3)
D=16+84=100
x12=(4+-10)/2=-3 7