2025 · Q18
What is the LCM of [the exact list of expressions involving x^4+x^2y^2+y^4 could not be verified from available sources]?
Elementary MathematicsHCF and LCM
- Ax^3y^3(x^6-y^6)
- Bx^3y^2(x^6-y^6)
- Cx^3y(x^6-y^6)
- Dxy(x^6-y^6)
Explanation
The stem asks for the LCM of expressions built from x^4+x^2y^2+y^4, but the exact list could not be recovered. (Recall x^4+x^2y^2+y^4=(x^2+xy+y^2)(x^2-xy+y^2).) The key is taken from the published coaching key (PW, CDS 2 2025 Set A: B). Note: key disputed - independent verification inconclusive.