exam Maths Puzzle Numerical Ability

Which of the following polynomials can be factored as a difference of two squares?

16x2 + 1
9y2 - 1
x2 + 4x + 4
144a2 + 16
all of the above

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exam Other Question

The length of a rectangle is 4 times the width. The perimeter is 90 cm. Find the width and length. how do you simplify, and write an answer as a power of 10? ex. 10power of -2 divided by 10 -4power