determine whether the value of variable of the roots of the quadratic equations or not x²-4x-5=0 x=1,-1
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x²-4x-5=0
given value of x=1,-1
when x=1
(1)² -4×1 -5 = 1 - 4 - 5 = -8 does not satisfied the given condition x²-4x-5=0
when x= -1
(-1)²-4 × (-1) -5= 1 +4-5= 0 satisfied the given condition x²-4x-5 = 0
Therefore x=-1 is the only root of given equation
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