exam Maths Puzzle Numerical Ability

find the GCF of 90x2,60x6,80x4

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exam Other Question

To whom may it concern,

I have this tricky question to solve.

If x + 2y = -2 and x - 2y = 18, find the value of x^2 + 4y^2.

According to my teacher, the answer is 164 but how ?

Please help. Thanks.

CH Lam Factor. 8m^4n - 16mn^4

thanks