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= k² + kl - kl - l²
= k² - l²
2. (m + n)(m - n)
= m² - mn + mn - n²
= m² - n²
3. ( x + y)(x - y)
= x² - xy + xy - y²
= x² - y²
kesimpulan
(a + b)(a - b) = a² - b²
semogamembantu♣
m^2 - mn + mn - n^2 = m^2 - n^2
x^2 - xy + xy - y^2 = x^2 - y^2