exam Maths Puzzle Numerical Ability

Multiply : (4x^2y^2), (6ax^2y^6)

The answer I came up with is: 24ax^4y^12
Explanation for my answer: I multiplied 4*6, then x^2 and left the "a" as is. I also muliplied y^2 * y^6. Please help me thank you!

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exam Other Question

Solve by any method: First of what are all the methods?

-4x + 3y = 2
5x - 2y = -3
Find the two roots of each of the following equation.

x2 = 25

(x - 2)2 = 16