exam Maths Puzzle Numerical Ability

Find a value for k so that 9m^2 - kn^2 will have the factors 3m + 7n and 3m - 7n.

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exam Other Question

if (2,4) is the location of the centroid of a triangle. which CANNOT be the coordinates of the verticles of the triangle?
F= (0,0),(0,6),(6,6)
G=(3,4),(3,-2),(0,6)
H= (3,-2),(1,6),(2,8)
J= (2,0) ,(1,8),(3,4) Please help me solve this inequality:3m>5m=12