Intersections 3

Find the intersections of the circles x2 + y2 + 6 x - 10 y + 9 = 0 and x2 + y2 + 18 x + 4 y + 21 = 0

Correct answer:

x1 =  -1.3335
y1 =  0.2859
x2 =  -7.9135
y2 =  5.9259

Step-by-step explanation:

x2+y2+6 x10 y+9=0 x2+y2+18 x+4 y+21=0  e2e1: (186)x+(4+10)y+(219)=0 y=6/7(x+1)  x2+(6/7(x+1))2+6x10(6/7(x+1))+9=0  x2+(6/7(x+1))2+6 x10(6/7(x+1))+9=0 1.73469387755x2+16.041x+18.306=0  a=1.73469387755;b=16.041;c=18.306 D=b24ac=16.041241.7346938775518.306=130.285714286 D>0  x1,2=b±D2a=16.04±130.293.4693877551 x1,2=4.62352941±3.28999742325 x1=1.33353198852=1.3335 x2=7.91352683501   Factored form of the equation:  1.73469387755(x+1.33353198852)(x+7.91352683501)=0

Our quadratic equation calculator calculates it.

y1=6/7 (x1+1)=6/7 ((1.3335)+1)=0.2859
y2=6/7 (x2+1)=6/7 ((7.9135)+1)=5.9259

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