. If r = -9, then the value of r2 – 2r – 9 is
If r = -9, then the value of r2 – 2r – 9 is
(a) 80.
(b) 90.
(c) 100.
(d) 150
Best Answer
Ans: (b)
Explanation:
Substituting r = -9 in r2 – 2r – 9, we get
(-9)2 – 2(-9) - 9 = 81 + 18 - 9 = 90
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