Question

$(2 \5 \ + x)( 2\5\ -x)(4 \25 \ + x2$
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Answer 1

Answer:

=4-2x+2x-x^2(45+x^2)

= 4-x^2(45+x^2)

= 180+4x^2-45x^2-x^4

= 189-41x^2-x^4

=-x^4-41x^2+189