Giải bài toán lớp 8 ứng dụng hằng đẳng thức (tiếp) #trainghiem2026

This video provides a step-by-step mathematical tutorial for 8th-grade students on how to evaluate an algebraic expression using identities. Given the condition $x - y = 2$, the instructor demonstrates how to simplify the expression $A = 2(x^3 - y^3) - 3(x + y)^2$ to find its numerical value.