Explanation:
1) 7x(x - 2y)
= (7x . x) - (7x . 2y)
= 7x² - 14xy
2) (2 + 1)(+5)
= 3(+5)
= (3 . +5)
= (3 . 5)
= 15
7x(x - 2y)
= 7x.(x - 2y)
= (2 + 1)(+5)
= (3)(5)
= 3 × 5
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