If 5 is a root of the equation 2x2 – 6x – 5a = 0, then
the value of a2 – 2a is
(1) 24 (2) 12
(3) 14 (4) 8
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2x²-6x-5a
x=5 is a root.
so,2(5)²-6(5)-5a=0
50-30-5a=0
-5a=-20
a=4
a²-2a=(4)²-2(4)
=16-8=8.
ans is 8
x=5 is a root.
so,2(5)²-6(5)-5a=0
50-30-5a=0
-5a=-20
a=4
a²-2a=(4)²-2(4)
=16-8=8.
ans is 8
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