Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(8a-6b\text{ [met a = 1 en b = 2]}\)
2. \(4a^2-4b\text{ [met a = 6 en b = 1]}\)
3. \(9a-b\text{ [met a = 5 en b = -5]}\)
4. \(a^2+6b\text{ [met a = 3 en b = 6]}\)
5. \(3ab-3b-2\text{ [met a = 3 en b = 2]}\)
6. \(4ab-3b+14\text{ [met a = -3 en b = 4]}\)
7. \(3a-6b\text{ [met a = -4 en b = -5]}\)
8. \(2a^2+4b\text{ [met a = 4 en b = -2]}\)
9. \(10a+3b\text{ [met a = 3 en b = 3]}\)
10. \(2ab+3b+14\text{ [met a = -2 en b = 2]}\)
11. \(7a-b\text{ [met a = 1 en b = -4]}\)
12. \(2ab+4b-6\text{ [met a = -4 en b = 3]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 8a-6b&=8.a-6.b \text{ [met a = 1 en b = 2]}\\&=8.1-6.2\\&=-4\\ \end{align}\)
2. \(\begin{align} 4a^2-4b&=4.a^2-4.b \text{ [met a = 6 en b = 1]}\\&=4.6^2-4.1\\&=140\\ \end{align}\)
3. \(\begin{align} 9a-b&=9.a-1.b \text{ [met a = 5 en b = -5]}\\&=9.5-1.(-5)\\&=50\\ \end{align}\)
4. \(\begin{align} a^2+6b&=1.a^2+6.b \text{ [met a = 3 en b = 6]}\\&=1.3^2+6.6\\&=45\\ \end{align}\)
5. \(\begin{align} 3ab-3b-2&=3.a.b-3.b-2 \text{ [met a = 3 en b = 2]}\\&=3.3.2-3.2-2\\&=10\\ \end{align}\)
6. \(\begin{align} 4ab-3b+14&=4.a.b-3.b+14 \text{ [met a = -3 en b = 4]}\\&=4.(-3).4-3.4+14\\&=-46\\ \end{align}\)
7. \(\begin{align} 3a-6b&=3.a-6.b \text{ [met a = -4 en b = -5]}\\&=3.(-4)-6.(-5)\\&=18\\ \end{align}\)
8. \(\begin{align} 2a^2+4b&=2.a^2+4.b \text{ [met a = 4 en b = -2]}\\&=2.4^2+4.(-2)\\&=24\\ \end{align}\)
9. \(\begin{align} 10a+3b&=10.a+3.b \text{ [met a = 3 en b = 3]}\\&=10.3+3.3\\&=39\\ \end{align}\)
10. \(\begin{align} 2ab+3b+14&=2.a.b+3.b+14 \text{ [met a = -2 en b = 2]}\\&=2.(-2).2+3.2+14\\&=12\\ \end{align}\)
11. \(\begin{align} 7a-b&=7.a-1.b \text{ [met a = 1 en b = -4]}\\&=7.1-1.(-4)\\&=11\\ \end{align}\)
12. \(\begin{align} 2ab+4b-6&=2.a.b+4.b-6 \text{ [met a = -4 en b = 3]}\\&=2.(-4).3+4.3-6\\&=-18\\ \end{align}\)