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4.13 (1) Show that the locus of the points P(x, y) obeying the equation x² + y² + 2x + 2y +c=0 represents a circle. (ii) Express the coordinates of the

center and the radius. Use the following equations of circles to find the centers and radii. +²+8x-4y + 11 = 0 x+y²-10x-6y +9=0 225x² +225 +90x - 300y + 28=0 jest. oooo FIGURE MA-6 A series RLC in circuit for Problem 4.12. JOC WC

Fig: 1