exam Maths Puzzle Numerical Ability

factor the polynomial 4a^2-4ac+4c^2, please

Also factor 16a^2-9c^2

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exam Other Question

Solve the systemby addition or substitution.
3x -4y =8
6x -2y =10

This is the answer I got:
9x-6y =18 proove that square root of 2 is irrational!