Tentukan hasil perkalian berikut. a. (x + 5y) (x - 3y) b. (2x - 3) (x² + 3x - 2) PAKAI CARA YA...

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a. (x + 5y) (x-3y)
= ( x × x) (x × (-3y)) (5y × x) (5y × (-3y))
= x^2-3xy+5xy-15y^2
= x^2+2xy-15y^2

b. (2x-3) (x^2+3x-2)
=(2x × x^2) (2x × 3x) (2x × (-2)) (-3 × x^2) (-3 × 3x) (-3 × (-2))
=2x^3+6x^2-4x-3x^2-9x+6
=2x^3+6x^2-3x^2-4x-9x+6
=2x^3+3x^2-13x+6.
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