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  1. Go through the explanation you should be able to solve them

    Step-by-step explanation:

    How do you know a difference of two square;

    Let's consider the example below;

    x^2 - 9 = ( x+ 3)( x-3); this is a difference of two square because 9 is a perfect square.

    Let's consider another example,

    2x^2 - 18

    If we divide through by 2 we have:

    2x^2/2 -18 /2 = x^2 - 9 ; which is a perfect square as shown above

    Let's take another example;

    x^6 - 64

    The above expression is the same as;

    (x^3)^2 -( 8)^2= (x^3 + 8) (x^3 -8); this is a difference of 2 square.

    Let's take another example

    a^5 - y^6 ; a^5 - (y ^3)^2

    We cannot simplify a^5 as we did for y^6; hence the expression is not a perfect square

    Lastly let's consider

    a^4 - b^4 we can simplify it as (a^2)^2 - (b^2)^2 ; which is a perfect square because it evaluates to

    (a^2 + b^2) ( a^2 - b^2)

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