Question

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Answer 1

$a. \: \: {m}^{2} - 2m \\ = {5}^{2} - 2 \times 5 \\ = 25 - 10 = 15$

$b. \: \: 3y - 2y \\ = 3 \times 4 - 2 \times 4 \\ = 12 - 8 = 4$

Answer 2

a) 25 - 2 • 5
25 - 10
15

b) 12 - 8 = 4