Question

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Answer 1

Answer:

1. $x ^{2} - 4y \\ - 3 ^{2} - 4 \times ( - 2) \\ = - 9 - ( - 8) \\ = - 9 + 8 = - 1$
2. $4a - b \div a + b \\ = 4 \times 6 - ( - 3) \div 6 + ( - 3) \\ = 24 + 3 \div 6 - 3 \\ = 27 \div 3 = 9$
3. $(5r)^{2}s \\ = (5 \times (- 4) ) ^{2} - 2 \\ = - 20 ^{2} - 2 \\ = 400 - 2 \\ = 398$
4. $(3m) ^{2} n ^{3} \\ = (3 \times 4) ^{2} - 2 ^{3} \\ = 12 ^{2} - 2 ^{3} \\ = 144 - 4 = 140$

${x}^{2} - 4y + 5xz \\ = {3}^{2} - 4 \times ( - 2) + 5 \times (3 + 4) \\ = 9 - ( - 8) + 5 \times 7 \\ = 17 + 35 \\ = 52$

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