"x2 = 100" is an equation which, if solved for x, will give you two possible value: 10 and -10.
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X2 + y2 = 100 = r2 r = 10
x2 + x2 = 2x2
y varies inversely as x2 so y = c/x2 for some constant c. When x = 5, y = 4 So c = x2y = 100 that is y = 100/x2 Then, when x = 2, y = 100/4 = 25
x2 + 20x - 39 = 0: Add 61 giving: x2 + 20x + 100 = (x + 10)2
x4+100=29x2 x4+100-29x2=0 (X2)2+100-29x2=0 (x2-25)(x2-4)=0 (x+5)(x-5)(x+2)(x-2) x=-5 x=5 x=-2 x=2