Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(4a^2-3b\text{ [met a = -4 en b = -4]}\)
2. \(a^2-b\text{ [met a = 2 en b = 6]}\)
3. \(5ab-2b+14\text{ [met a = 5 en b = 6]}\)
4. \(4a+5b\text{ [met a = -3 en b = 5]}\)
5. \(3a^2-3b\text{ [met a = 2 en b = 1]}\)
6. \(2ab-b+6\text{ [met a = -3 en b = 4]}\)
7. \(6a-6b\text{ [met a = 4 en b = -2]}\)
8. \(a^2-3b\text{ [met a = 6 en b = -2]}\)
9. \(a^2-2b\text{ [met a = -4 en b = 2]}\)
10. \(2ab-3b-13\text{ [met a = 4 en b = -3]}\)
11. \(3ab-3b-15\text{ [met a = -3 en b = -4]}\)
12. \(4ab+3b-5\text{ [met a = 6 en b = 1]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 4a^2-3b&=4.a^2-3.b \text{ [met a = -4 en b = -4]}\\&=4.(-4)^2-3.(-4)\\&=76\\ \end{align}\)
2. \(\begin{align} a^2-b&=1.a^2-1.b \text{ [met a = 2 en b = 6]}\\&=1.2^2-1.6\\&=-2\\ \end{align}\)
3. \(\begin{align} 5ab-2b+14&=5.a.b-2.b+14 \text{ [met a = 5 en b = 6]}\\&=5.5.6-2.6+14\\&=152\\ \end{align}\)
4. \(\begin{align} 4a+5b&=4.a+5.b \text{ [met a = -3 en b = 5]}\\&=4.(-3)+5.5\\&=13\\ \end{align}\)
5. \(\begin{align} 3a^2-3b&=3.a^2-3.b \text{ [met a = 2 en b = 1]}\\&=3.2^2-3.1\\&=9\\ \end{align}\)
6. \(\begin{align} 2ab-b+6&=2.a.b-1.b+6 \text{ [met a = -3 en b = 4]}\\&=2.(-3).4-1.4+6\\&=-22\\ \end{align}\)
7. \(\begin{align} 6a-6b&=6.a-6.b \text{ [met a = 4 en b = -2]}\\&=6.4-6.(-2)\\&=36\\ \end{align}\)
8. \(\begin{align} a^2-3b&=1.a^2-3.b \text{ [met a = 6 en b = -2]}\\&=1.6^2-3.(-2)\\&=42\\ \end{align}\)
9. \(\begin{align} a^2-2b&=1.a^2-2.b \text{ [met a = -4 en b = 2]}\\&=1.(-4)^2-2.2\\&=12\\ \end{align}\)
10. \(\begin{align} 2ab-3b-13&=2.a.b-3.b-13 \text{ [met a = 4 en b = -3]}\\&=2.4.(-3)-3.(-3)-13\\&=-28\\ \end{align}\)
11. \(\begin{align} 3ab-3b-15&=3.a.b-3.b-15 \text{ [met a = -3 en b = -4]}\\&=3.(-3).(-4)-3.(-4)-15\\&=33\\ \end{align}\)
12. \(\begin{align} 4ab+3b-5&=4.a.b+3.b-5 \text{ [met a = 6 en b = 1]}\\&=4.6.1+3.1-5\\&=22\\ \end{align}\)