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Earlier discussion
2 older comments kept for context.
Oluwaseun Adeyemi
f = 10cm (Focal length of convex mirror is +ve)
V = 1/2 u
1/f = 1/v + 1/u
1/10 = 1/(1/2 u) + 1/u
1/10 = 2/u + 1/u
1/10 = (2+1)/u
1/10 = 3/u
u = 3(10) = 30cm
V = 1/2 × u = 1/2 × (30cm)
v = 15cm
Distance between the image and object = 15 + 30 = 45cm
Olalonpe
The distance should be subtracted