If the equation of the tangent to the curve y2 ax3 b at the point 2 3 is y 4x 5 then ........

If the equation of the tangent to the curve y² = ax³ + b at the point (2,3) is y =4x-5, then

a=2, b=7

a =7, b=2

a =2, b =-7

a= -2, b=7

a =2, b =-7

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