find the root of the quadratic equation √2x^3 + 7x + 5√2 = 0 by factorisation .
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√2 x^2+7x+5√2 = 0
√2 x^2+2x+ 5x+5√2 = 0
√2x ( x+√2)+5( x+√2) =0
√2x+5 = 0 ; x+√2 = 0
x = -5/√2. ; x = -√2
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