kalikan aljabar paling sederhana di atas

a. (x + 3)(x + 7) = x² + 7x + 3x + 21 = x² + 10x + 21
b. (3x - 7)2 = 6x - 14
c. (3x + 8)(x-6)=3x²- 18x + 8x - 48 = 3x²- 10x - 48