a). (x+5) × (x-5)
= x² - 5x + 5x - 25
=x² - 25
b). (x-7) × (x+7)
= x² + 7x -7x - 49
= x² - 49
c). (2a+6) × (b-3)
= 2ab - 6a + 6b - 18
d). (x-11) × (3x+9)
= 3x² + 9x - 33x - 99
=3x² - 24x - 99
semoga membantu:)
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a). (x+5) × (x-5)
= x² - 5x + 5x - 25
=x² - 25
b). (x-7) × (x+7)
= x² + 7x -7x - 49
= x² - 49
c). (2a+6) × (b-3)
= 2ab - 6a + 6b - 18
d). (x-11) × (3x+9)
= 3x² + 9x - 33x - 99
=3x² - 24x - 99
semoga membantu:)