Check whether x=-2 is the root of 3x2+14x+13=0
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3x²+14x+13=3(-2)²+14(-2)+13
=12-28+13
=25-28=-3 not equal to 0
so x=-2 is not a root of 3x²+14x+13
=12-28+13
=25-28=-3 not equal to 0
so x=-2 is not a root of 3x²+14x+13
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