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b. 5xpangkat2 - 24x - 5
c. 28x - 49 - 4xpangkat2
= 20y - 100
b. (x + 5)(5x - 1) = (x . 5x)(x . -1)(5 . 5x)(5 . -1)
= 5x² - x + 10x - 5
= 5x² + 9x - 5
c. (7 - 2x)(2x - 7) = (7 . 2x)(7 . -7)(-2x . 2x)(-2x . -7)
= 14x - 14 - 4x² + 14x
= 14x + 14x - 14 - 4x²
= 28x - 14 - 4x²
Maaf ya kalau salah
Semoga dapat membantu^_^_^_^