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Anonymous
(x-5)(x-6)
so x=5,6
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x3 + x2 - 6x + 4 = (x - 1)(x2 + 2x - 4)
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
The centre is (3,-1) and the radius is sqrt(10).
one
(3, -21)