Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 10a+10b&=10.a+10.b \text{ [met a = -2 en b = 4]}\\&=10.(-2)+10.4\\&=20\\ \end{align}\)
2. \(\begin{align} 2a^2-4b&=2.a^2-4.b \text{ [met a = 1 en b = -3]}\\&=2.1^2-4.(-3)\\&=14\\ \end{align}\)
3. \(\begin{align} 9a+7b&=9.a+7.b \text{ [met a = -5 en b = -5]}\\&=9.(-5)+7.(-5)\\&=-80\\ \end{align}\)
4. \(\begin{align} 5a+3b&=5.a+3.b \text{ [met a = -4 en b = -2]}\\&=5.(-4)+3.(-2)\\&=-26\\ \end{align}\)
5. \(\begin{align} 5a^2+4b&=5.a^2+4.b \text{ [met a = 4 en b = 4]}\\&=5.4^2+4.4\\&=96\\ \end{align}\)
6. \(\begin{align} 4a^2-2b&=4.a^2-2.b \text{ [met a = 6 en b = 2]}\\&=4.6^2-2.2\\&=140\\ \end{align}\)
7. \(\begin{align} ab-5b+3&=1.a.b-5.b+3 \text{ [met a = 2 en b = 1]}\\&=1.2.1-5.1+3\\&=0\\ \end{align}\)
8. \(\begin{align} 3ab-3b-8&=3.a.b-3.b-8 \text{ [met a = 2 en b = 1]}\\&=3.2.1-3.1-8\\&=-5\\ \end{align}\)
9. \(\begin{align} 5a^2+b&=5.a^2+1.b \text{ [met a = 4 en b = -2]}\\&=5.4^2+1.(-2)\\&=78\\ \end{align}\)
10. \(\begin{align} 9a+b&=9.a+1.b \text{ [met a = -4 en b = -4]}\\&=9.(-4)+1.(-4)\\&=-40\\ \end{align}\)
11. \(\begin{align} 2ab-5b-10&=2.a.b-5.b-10 \text{ [met a = 6 en b = 1]}\\&=2.6.1-5.1-10\\&=-3\\ \end{align}\)
12. \(\begin{align} 8a-9b&=8.a-9.b \text{ [met a = -5 en b = 5]}\\&=8.(-5)-9.5\\&=-85\\ \end{align}\)