If x = -2 is the root of the quadratic equation
x2-3x-a=0, then the value of 'a' is
1.-10
2. 3
3. 10
4.-3
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(-2)2 -3 × -2 -a = 0
4 + 6 - a = 0
10 = - a
a = -10
a is bigger than 0 ( so real roots exist).
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