Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 8a+7b&=8.a+7.b \text{ [met a = -1 en b = 5]}\\&=8.(-1)+7.5\\&=27\\ \end{align}\)
2. \(\begin{align} 2a^2+2b&=2.a^2+2.b \text{ [met a = -4 en b = 5]}\\&=2.(-4)^2+2.5\\&=42\\ \end{align}\)
3. \(\begin{align} 2a^2-6b&=2.a^2-6.b \text{ [met a = -5 en b = -1]}\\&=2.(-5)^2-6.(-1)\\&=56\\ \end{align}\)
4. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = 2 en b = 2]}\\&=2.2^2+3.2\\&=14\\ \end{align}\)
5. \(\begin{align} 4ab+2b+2&=4.a.b+2.b+2 \text{ [met a = 1 en b = 4]}\\&=4.1.4+2.4+2\\&=26\\ \end{align}\)
6. \(\begin{align} 4a+8b&=4.a+8.b \text{ [met a = -5 en b = -5]}\\&=4.(-5)+8.(-5)\\&=-60\\ \end{align}\)
7. \(\begin{align} 4ab-4b-9&=4.a.b-4.b-9 \text{ [met a = -2 en b = 3]}\\&=4.(-2).3-4.3-9\\&=-45\\ \end{align}\)
8. \(\begin{align} 10a+3b&=10.a+3.b \text{ [met a = -1 en b = -4]}\\&=10.(-1)+3.(-4)\\&=-22\\ \end{align}\)
9. \(\begin{align} a-9b&=1.a-9.b \text{ [met a = 2 en b = -2]}\\&=1.2-9.(-2)\\&=20\\ \end{align}\)
10. \(\begin{align} 3ab+5b-4&=3.a.b+5.b-4 \text{ [met a = -1 en b = 3]}\\&=3.(-1).3+5.3-4\\&=2\\ \end{align}\)
11. \(\begin{align} 3a+8b&=3.a+8.b \text{ [met a = 1 en b = 4]}\\&=3.1+8.4\\&=35\\ \end{align}\)
12. \(\begin{align} 4a^2-6b&=4.a^2-6.b \text{ [met a = -5 en b = 3]}\\&=4.(-5)^2-6.3\\&=82\\ \end{align}\)