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(x+y)(x-y) = x² - y²
a. (a+b)(a-b) = a² - b²
b. (3x+4)(3x-4) = (3x)² - 4² = 9x² - 16
rumusnya (x+y)(x-y) = (x² - y²)
jadi (a+b)(a-b) = (a² - b²)
2. (3x + 4)(3x - 4)
ingat rumus (x+y)(x-y)= (x² - y²)
jadi (3x +4)(3x-4) = (3x)² - 4² = 3²x² - 4² = 9x² - 16