If the curve y=ax2+bx+c,x∈R , passes through the point (1,2) and the tangent line to this curve at origin is y=x, then the possible values of a,b,c are
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a
a=12,b=12,c=1
b
a=1,b=0,c=1
c
a=−1,b=1,c=1
d
a=1,b=1,c=0
answer is D.
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Detailed Solution
The given curve is y=ax2+bx+c it is passing through the point (1,2)2=a+b+cthe slope of the tangetn at origin is 1 2ax+b at (0,0) is 1 b=1a+c=1, since the curve is pasing through the origin, the constant term must be zero2=a+b+c∣dydx(0,0)=1 ⇒b=1