Odpowiedź:
x = -3 , y = 8
lub
x =2 , y =13
Szczegółowe wyjaśnienie:
{ y = 2x²+3x-1
{ y = x+11
2x²+3x -1 = x+11
2x² +2x -12 =0
∆ = 2² -4*2*(-12) =4+96=100
√∆ =10
x1 = (-2-10)/(2*2) = -12/4 = -3
x2 = (-2+10)/(2*2) = 8/4 = 2
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y1 = x1+11 = -3+11 = 8
y2 = x2 +11 = 2 +11 = 13
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