Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 8a+9b&=8.a+9.b \text{ [met a = -4 en b = 3]}\\&=8.(-4)+9.3\\&=-5\\ \end{align}\)
2. \(\begin{align} 5ab+b-1&=5.a.b+1.b-1 \text{ [met a = -1 en b = 6]}\\&=5.(-1).6+1.6-1\\&=-25\\ \end{align}\)
3. \(\begin{align} 2a^2-4b&=2.a^2-4.b \text{ [met a = 1 en b = 2]}\\&=2.1^2-4.2\\&=-6\\ \end{align}\)
4. \(\begin{align} 3ab+5b-2&=3.a.b+5.b-2 \text{ [met a = -5 en b = 6]}\\&=3.(-5).6+5.6-2\\&=-62\\ \end{align}\)
5. \(\begin{align} 2ab+4b+8&=2.a.b+4.b+8 \text{ [met a = 1 en b = 3]}\\&=2.1.3+4.3+8\\&=26\\ \end{align}\)
6. \(\begin{align} 2a-2b&=2.a-2.b \text{ [met a = 1 en b = 1]}\\&=2.1-2.1\\&=0\\ \end{align}\)
7. \(\begin{align} ab+3b+10&=1.a.b+3.b+10 \text{ [met a = -5 en b = -1]}\\&=1.(-5).(-1)+3.(-1)+10\\&=12\\ \end{align}\)
8. \(\begin{align} 3a^2-2b&=3.a^2-2.b \text{ [met a = 6 en b = 1]}\\&=3.6^2-2.1\\&=106\\ \end{align}\)
9. \(\begin{align} a^2+4b&=1.a^2+4.b \text{ [met a = -4 en b = 4]}\\&=1.(-4)^2+4.4\\&=32\\ \end{align}\)
10. \(\begin{align} 10a+4b&=10.a+4.b \text{ [met a = 2 en b = 2]}\\&=10.2+4.2\\&=28\\ \end{align}\)
11. \(\begin{align} 5a+3b&=5.a+3.b \text{ [met a = -1 en b = 3]}\\&=5.(-1)+3.3\\&=4\\ \end{align}\)
12. \(\begin{align} 5ab-2b+2&=5.a.b-2.b+2 \text{ [met a = 1 en b = 1]}\\&=5.1.1-2.1+2\\&=5\\ \end{align}\)