Question 1112996
{{{f(x)=a(x-i)(x+i)(x-2i)(x+2i)}}}

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{{{f(x)=a(x^2+1)(x^2+4)}}}

{{{a((-1)^2+1)((-1)^2+4)=10}}}

{{{a*2*5=10}}}

{{{a=1}}}

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{{{highlight(f(x)=(x^2+1)(x^2+4))}}}