zeroes of xsquare minus root 2x minus 12
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=> x²-√2x-12 =0
=> x²+3√2x-2√2x-12
=> X(x+3√2)-2√2(X+3√2)
=> X+3√2. X-2√2
X= -3√2 , X=2√2
=> x²+3√2x-2√2x-12
=> X(x+3√2)-2√2(X+3√2)
=> X+3√2. X-2√2
X= -3√2 , X=2√2
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