Q12 uttar sanga

y² = a x³ + b
2y dy / dx = 3a x² + 0
dy / dx = 3a x² / 2y
touches at 2,3
dy / dx = 3 * a * 2² / 2 * 3
        m1   = 2a 
y = 4x - 5
m2 = 4
m1 = m2
2a = 4
a = 2
b = -7
i think its correct
hope it helps