Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2ab+4b+2&=2.a.b+4.b+2 \text{ [met a = 6 en b = -2]}\\&=2.6.(-2)+4.(-2)+2\\&=-30\\ \end{align}\)
2. \(\begin{align} 5ab+b+2&=5.a.b+1.b+2 \text{ [met a = -1 en b = 5]}\\&=5.(-1).5+1.5+2\\&=-18\\ \end{align}\)
3. \(\begin{align} 5ab+2b+1&=5.a.b+2.b+1 \text{ [met a = 6 en b = -3]}\\&=5.6.(-3)+2.(-3)+1\\&=-95\\ \end{align}\)
4. \(\begin{align} 2a^2+b&=2.a^2+1.b \text{ [met a = -3 en b = -3]}\\&=2.(-3)^2+1.(-3)\\&=15\\ \end{align}\)
5. \(\begin{align} 4ab-3b+15&=4.a.b-3.b+15 \text{ [met a = -1 en b = 5]}\\&=4.(-1).5-3.5+15\\&=-20\\ \end{align}\)
6. \(\begin{align} 5a^2+4b&=5.a^2+4.b \text{ [met a = 1 en b = 5]}\\&=5.1^2+4.5\\&=25\\ \end{align}\)
7. \(\begin{align} 3ab+5b+1&=3.a.b+5.b+1 \text{ [met a = 1 en b = -3]}\\&=3.1.(-3)+5.(-3)+1\\&=-23\\ \end{align}\)
8. \(\begin{align} a^2-3b&=1.a^2-3.b \text{ [met a = -1 en b = -1]}\\&=1.(-1)^2-3.(-1)\\&=4\\ \end{align}\)
9. \(\begin{align} 5a^2-6b&=5.a^2-6.b \text{ [met a = 6 en b = 3]}\\&=5.6^2-6.3\\&=162\\ \end{align}\)
10. \(\begin{align} 3a-3b&=3.a-3.b \text{ [met a = 4 en b = 1]}\\&=3.4-3.1\\&=9\\ \end{align}\)
11. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = 6 en b = 2]}\\&=2.6^2+3.2\\&=78\\ \end{align}\)
12. \(\begin{align} 3a^2-3b&=3.a^2-3.b \text{ [met a = 3 en b = -2]}\\&=3.3^2-3.(-2)\\&=33\\ \end{align}\)