(3x^2+2)^2-(3x^2-2)^2= 9x^4+12x^2+4-(9x^4-12x^2+4)= 9x^4+12x^2+4-9x^2+12x^2-4=2×(12x^2)=24x^2
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(3x^2+2)^2-(3x^2-2)^2= 9x^4+12x^2+4-(9x^4-12x^2+4)= 9x^4+12x^2+4-9x^2+12x^2-4=2×(12x^2)=24x^2