Question

Help me please in this ques

Answer 1

Answer:

see the attachment.........

Answer 2

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We will use the difference of squares identity which can be written:

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

So we note that:

$x^4-13x^2+36$

=$(x^2)^2-13(x^2)+36$

=$(x^2-9)(x^2-4)$

=$(x-3)(x+3)(x-2)(x+2)$