x2 + 10 x + 25 = 2
(x+5)2 = 2
x+5 = +/- sqrt(2)
x = -5 +/- sqrt(2)
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x2 + 10x + 21 = (x + 3)(x + 7)
Complete the squares: x2 - 10x + 25 + y2 + 4y + 4 - 52 = 25 + 4 = 29 x2 - 10x + 25 + y2 + 4y + 4 = 52 + 29 = 81 So the radius is sqrt(81) = 9
x2+10x+25
x2 - 10x + 25 = 64 Or x2 - 10x + 25 = 64? If the first, move all over to 1 side; x2 - 10x + 25 - 64 = 0 x2 - 10x + -39 = 0 Then make it into quadratic equations; (x - 13)(x + 3) = 0 Therefore x = 13 or x = -3. If the second, 8x = -39 -39/8 = -9.75 = x
y=x2-10x+30=(x-5)2-25+30=(x-5)2+5