The third zero of the polynomial x3 - 2x + 7x2 -14, if two of its zeroes are √2 and -√2
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x³-2x+7x²-14 = 0
=> x(x²-2)+7(x²-2) = 0
=> (x²-2)(x+7) = 0
∴ x = ±√2, -7
∴ -7 is the third zero of the polynomial.
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