Question

check whether x=-√2,-2√2 are roots of x square+√2x-4=0

Answer 1

if X is √2
X square+√2x-4
2+2-4 =0
so √2 is a root of X square+√2x-4
if X is -2√2
X square+2√2x-4
8-4-4=0
so -2√2 is a root of X square+2√2x-4

Answer 2

Here is your answer-.

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