Tentukan hasil perkalian dari :
a). 5x² (6x − 3y)
b). (2x − 2)(x + 5)
c). (x − 5)(x² − 4x + 20)
a). 5x² (6x − 3y)
b). (2x − 2)(x + 5)
c). (x − 5)(x² − 4x + 20)
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30x³ -15x²y
b. (2x -2) (x +5)
2x² +10x -2x -10
2x² +8x -10
c. (x -5) (x² -4x +20)
x³ -4x² +20x -5x² +20x -100
x³ -4x² -5x² +20x +20x -100
x³ -9x² +40x -100
b. (2x - 2) (x + 5) = 2x² +10x - 2x - 10
= 2x² + 8x - 10
c. (x - 5) (x² - 4x - 20) = x³ - 4x² - 20x - 5x² +20x +100
= x³ - 4x² - 5x² - 20x +20x + 100
= x³ - 9x² + 100