tentukan hasil perkalian bentuk aljabar berikut a. (×+5) (×-2) b. (2×-3) (ײ -2×+3) #jawab dengan caranya

a.
[tex](x + 5)(x - 2) \\ = (x \times x) + (x \times ( - 2)) + (5 \times x) + (5 \times ( - 2)) \\ = {x}^{2} - 2x + 5x - 10 \\ = {x}^{2} +3 x - 10[/tex]

b.
[tex](2x - 3)( {x}^{2} - 2x +3 ) \\ = (2x \times {x}^{2} ) + (2x \times ( - 2x)) + (2x \times 3) + ( - 3 \times {x}^{2} ) + ( - 3 \times ( - 2x)) + ( - 3 \times 3) \\ = 2 {x}^{3} - 4 {x}^{2} + 6x - 3 {x}^{2} + 6x - 9 \\ = 2 {x}^{3} + ( - 4 {x}^{2} - 3 {x}^{2} ) + (6x + 6x) - 9 \\ =2 {x}^{3} - 7 {x}^{2} + 12x - 9[/tex]