e). (5a+5) × (7b-7)
= 35ab - 35a + 35b - 35
f). (x+9) × (x+4)
= x² + 4x + 9x + 36
= x² + 13x +36
maaf kalo salah, semoga membantu:)
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35ab-35a+35b-35
F.(x+9)x(x+4)
x²+4x+9x+36
x²+13x+36
e). (5a+5) × (7b-7)
= 35ab - 35a + 35b - 35
f). (x+9) × (x+4)
= x² + 4x + 9x + 36
= x² + 13x +36
maaf kalo salah, semoga membantu:)