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= 2x x 3x + 2x x 5 + 3 x 3x + 3 x 5
= 6x² + 10x + 9x + 15
=6x² + 19x + 15
2. (3x - 4) (x + 1)
= 3x x x + 3x x 1 + ( - 4) x x + (- 3) x 1
= 3x² + 3x - 4x - 3
= 3x² + - 1 - 3
3. (2x - y) (3x - 2y)
= 2x x 3x + 2x ( - 2y) + ( - y) x 3x + (- y) x (- 2y)
= 6x² - 4xy - 3xy + 2
= 6x² - 7xy + 2
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