Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 3a^2-2b&=3.a^2-2.b \text{ [met a = -4 en b = -2]}\\&=3.(-4)^2-2.(-2)\\&=52\\ \end{align}\)
2. \(\begin{align} 5a^2-3b&=5.a^2-3.b \text{ [met a = 3 en b = -5]}\\&=5.3^2-3.(-5)\\&=60\\ \end{align}\)
3. \(\begin{align} 4ab-4b-9&=4.a.b-4.b-9 \text{ [met a = 4 en b = -3]}\\&=4.4.(-3)-4.(-3)-9\\&=-45\\ \end{align}\)
4. \(\begin{align} 5a-6b&=5.a-6.b \text{ [met a = 5 en b = -2]}\\&=5.5-6.(-2)\\&=37\\ \end{align}\)
5. \(\begin{align} 3ab+2b-9&=3.a.b+2.b-9 \text{ [met a = 2 en b = 6]}\\&=3.2.6+2.6-9\\&=39\\ \end{align}\)
6. \(\begin{align} 7a+5b&=7.a+5.b \text{ [met a = 3 en b = 3]}\\&=7.3+5.3\\&=36\\ \end{align}\)
7. \(\begin{align} 2a^2-b&=2.a^2-1.b \text{ [met a = 3 en b = 3]}\\&=2.3^2-1.3\\&=15\\ \end{align}\)
8. \(\begin{align} 2a^2+4b&=2.a^2+4.b \text{ [met a = 6 en b = 6]}\\&=2.6^2+4.6\\&=96\\ \end{align}\)
9. \(\begin{align} 3a^2+5b&=3.a^2+5.b \text{ [met a = -3 en b = 3]}\\&=3.(-3)^2+5.3\\&=42\\ \end{align}\)
10. \(\begin{align} 2ab+b-11&=2.a.b+1.b-11 \text{ [met a = 6 en b = 2]}\\&=2.6.2+1.2-11\\&=15\\ \end{align}\)
11. \(\begin{align} 10a+8b&=10.a+8.b \text{ [met a = 5 en b = 4]}\\&=10.5+8.4\\&=82\\ \end{align}\)
12. \(\begin{align} 4a^2+4b&=4.a^2+4.b \text{ [met a = 2 en b = -3]}\\&=4.2^2+4.(-3)\\&=4\\ \end{align}\)