Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(3ab-2b+10\text{ [met a = 5 en b = -5]}\)
2. \(5a^2+3b\text{ [met a = 6 en b = -2]}\)
3. \(5ab+3b+15\text{ [met a = -5 en b = -1]}\)
4. \(4a^2-2b\text{ [met a = 6 en b = 1]}\)
5. \(5ab-3b-5\text{ [met a = -4 en b = -1]}\)
6. \(4a^2-6b\text{ [met a = 2 en b = -2]}\)
7. \(2a^2+3b\text{ [met a = -3 en b = 5]}\)
8. \(3a^2-3b\text{ [met a = -5 en b = -4]}\)
9. \(a-3b\text{ [met a = 1 en b = 3]}\)
10. \(2a^2-3b\text{ [met a = -4 en b = -1]}\)
11. \(4a^2+5b\text{ [met a = 3 en b = -4]}\)
12. \(2ab-4b+3\text{ [met a = -2 en b = 4]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 3ab-2b+10&=3.a.b-2.b+10 \text{ [met a = 5 en b = -5]}\\&=3.5.(-5)-2.(-5)+10\\&=-55\\ \end{align}\)
2. \(\begin{align} 5a^2+3b&=5.a^2+3.b \text{ [met a = 6 en b = -2]}\\&=5.6^2+3.(-2)\\&=174\\ \end{align}\)
3. \(\begin{align} 5ab+3b+15&=5.a.b+3.b+15 \text{ [met a = -5 en b = -1]}\\&=5.(-5).(-1)+3.(-1)+15\\&=37\\ \end{align}\)
4. \(\begin{align} 4a^2-2b&=4.a^2-2.b \text{ [met a = 6 en b = 1]}\\&=4.6^2-2.1\\&=142\\ \end{align}\)
5. \(\begin{align} 5ab-3b-5&=5.a.b-3.b-5 \text{ [met a = -4 en b = -1]}\\&=5.(-4).(-1)-3.(-1)-5\\&=18\\ \end{align}\)
6. \(\begin{align} 4a^2-6b&=4.a^2-6.b \text{ [met a = 2 en b = -2]}\\&=4.2^2-6.(-2)\\&=28\\ \end{align}\)
7. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = -3 en b = 5]}\\&=2.(-3)^2+3.5\\&=33\\ \end{align}\)
8. \(\begin{align} 3a^2-3b&=3.a^2-3.b \text{ [met a = -5 en b = -4]}\\&=3.(-5)^2-3.(-4)\\&=87\\ \end{align}\)
9. \(\begin{align} a-3b&=1.a-3.b \text{ [met a = 1 en b = 3]}\\&=1.1-3.3\\&=-8\\ \end{align}\)
10. \(\begin{align} 2a^2-3b&=2.a^2-3.b \text{ [met a = -4 en b = -1]}\\&=2.(-4)^2-3.(-1)\\&=35\\ \end{align}\)
11. \(\begin{align} 4a^2+5b&=4.a^2+5.b \text{ [met a = 3 en b = -4]}\\&=4.3^2+5.(-4)\\&=16\\ \end{align}\)
12. \(\begin{align} 2ab-4b+3&=2.a.b-4.b+3 \text{ [met a = -2 en b = 4]}\\&=2.(-2).4-4.4+3\\&=-29\\ \end{align}\)