Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(6a+8b\text{ [met a = -3 en b = -4]}\)
2. \(a^2+3b\text{ [met a = -5 en b = -3]}\)
3. \(5ab+b+8\text{ [met a = 4 en b = 6]}\)
4. \(ab-3b+14\text{ [met a = 6 en b = 6]}\)
5. \(3ab+b-13\text{ [met a = 1 en b = -1]}\)
6. \(3a^2-4b\text{ [met a = 3 en b = -4]}\)
7. \(4a+b\text{ [met a = -1 en b = 2]}\)
8. \(5a^2-3b\text{ [met a = 2 en b = 6]}\)
9. \(3ab-4b+7\text{ [met a = 3 en b = 1]}\)
10. \(2a-9b\text{ [met a = 2 en b = 4]}\)
11. \(2ab-3b-7\text{ [met a = -1 en b = -2]}\)
12. \(3a+5b\text{ [met a = 3 en b = 1]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 6a+8b&=6.a+8.b \text{ [met a = -3 en b = -4]}\\&=6.(-3)+8.(-4)\\&=-50\\ \end{align}\)
2. \(\begin{align} a^2+3b&=1.a^2+3.b \text{ [met a = -5 en b = -3]}\\&=1.(-5)^2+3.(-3)\\&=16\\ \end{align}\)
3. \(\begin{align} 5ab+b+8&=5.a.b+1.b+8 \text{ [met a = 4 en b = 6]}\\&=5.4.6+1.6+8\\&=134\\ \end{align}\)
4. \(\begin{align} ab-3b+14&=1.a.b-3.b+14 \text{ [met a = 6 en b = 6]}\\&=1.6.6-3.6+14\\&=32\\ \end{align}\)
5. \(\begin{align} 3ab+b-13&=3.a.b+1.b-13 \text{ [met a = 1 en b = -1]}\\&=3.1.(-1)+1.(-1)-13\\&=-17\\ \end{align}\)
6. \(\begin{align} 3a^2-4b&=3.a^2-4.b \text{ [met a = 3 en b = -4]}\\&=3.3^2-4.(-4)\\&=43\\ \end{align}\)
7. \(\begin{align} 4a+b&=4.a+1.b \text{ [met a = -1 en b = 2]}\\&=4.(-1)+1.2\\&=-2\\ \end{align}\)
8. \(\begin{align} 5a^2-3b&=5.a^2-3.b \text{ [met a = 2 en b = 6]}\\&=5.2^2-3.6\\&=2\\ \end{align}\)
9. \(\begin{align} 3ab-4b+7&=3.a.b-4.b+7 \text{ [met a = 3 en b = 1]}\\&=3.3.1-4.1+7\\&=12\\ \end{align}\)
10. \(\begin{align} 2a-9b&=2.a-9.b \text{ [met a = 2 en b = 4]}\\&=2.2-9.4\\&=-32\\ \end{align}\)
11. \(\begin{align} 2ab-3b-7&=2.a.b-3.b-7 \text{ [met a = -1 en b = -2]}\\&=2.(-1).(-2)-3.(-2)-7\\&=3\\ \end{align}\)
12. \(\begin{align} 3a+5b&=3.a+5.b \text{ [met a = 3 en b = 1]}\\&=3.3+5.1\\&=14\\ \end{align}\)