exam Maths Puzzle Numerical Ability

Please help me with this problem, im stuck.

Factor completely.

4a^2 + 12ab + 9b^2 - 25c^2

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exam Other Question

The present ages of a husband and wife are in the ratio of seven to six, and five years ago the ratio was six to five. Find their ages now. a@b = a+(b+1)

is @ associative (use variable to prove)