jawab
14. x(*2x + 5) + 7(x-y)
= 2x² + 5x + 7x - 7y
= 2x² + 12 x - 7y
15. x(4x- 3y) + 2y (4x - 4y) =
= 4x² - 3xy + 9 xy -8y²
= 4x² + 6 xy - 8y²
16. 3a + 9b + 12 c =
= 3 (a + 3b + 4c)
17. a² + ab - ac =
= a (a + b + c)
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Verified answer
jawab
14. x(*2x + 5) + 7(x-y)
= 2x² + 5x + 7x - 7y
= 2x² + 12 x - 7y
15. x(4x- 3y) + 2y (4x - 4y) =
= 4x² - 3xy + 9 xy -8y²
= 4x² + 6 xy - 8y²
16. 3a + 9b + 12 c =
= 3 (a + 3b + 4c)
17. a² + ab - ac =
= a (a + b + c)