Answer
$(x^{2}+2)(x^{2}+3)$
Work Step by Step
Step 1: $x^{4}+5x^{2}+6$
Step 2: $x^{4}+2x^{2}+3x^{2}+6$
Step 3: $x^{2}(x^{2}+2)+3(x^{2}+2)$
Step 4: $(x^{2}+2)(x^{2}+3)$
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