exam Maths Puzzle Numerical Ability

I couldnt figure out this factoring problem

4x^2+16xy-9y^2

THANKS FOR THE HELP

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exam Other Question

the diameter of a roller is 84 cm. and its length is 120 cm.it takes 500 complete revolution to move once over to level a playground find the area of the playground in meter square What is the slope and y intercept of the following

y = -x