exam Maths Puzzle Numerical Ability

Please help I am lost I do not understand how to factor the following binomials

64y^2- x^2

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exam Other Question

Simplify

(20 x 10 -4 power)(4 x 10 nine power)/3,200 x 10 -3 power If the square of 2 less than an integer is 16, find the number(s).