Hasil kali dari bentuk bentuk aljabar berikut a. 10 x (2y - 10) b. (x + 5) x (5x - 1) c. (7 - 2x) × (2x - 7)
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b.5x²-x + 25x-5=5x² + 24x-5
c.14x-49-4x²+14x=-4x²+28x-49
b. (x + 5) (5x - 1) = 5x² - x + 25x - 5 = 5x² + 24x - 5
c. (7 - 2x) (2x - 7) = 14x - 49 - 4x² + 14x = 4x² +14x + 14x - 49
= 4x² + 28x - 49