1) (m+n)(m-n) = m²-n²
2) (a-c)(a+c) = a²-c²
3) (2+x)(2-x) = 2²-x² = 4-x²
4) (2x)² - (3y)² = 4x²-9y²
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Answers & Comments
1) (m+n)(m-n) = m²-n²
2) (a-c)(a+c) = a²-c²
3) (2+x)(2-x) = 2²-x² = 4-x²
4) (2x)² - (3y)² = 4x²-9y²