Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 3a+7b&=3.a+7.b \text{ [met a = 1 en b = 1]}\\&=3.1+7.1\\&=10\\ \end{align}\)
2. \(\begin{align} 2a^2+4b&=2.a^2+4.b \text{ [met a = -4 en b = 6]}\\&=2.(-4)^2+4.6\\&=56\\ \end{align}\)
3. \(\begin{align} 4a^2+3b&=4.a^2+3.b \text{ [met a = -4 en b = -5]}\\&=4.(-4)^2+3.(-5)\\&=49\\ \end{align}\)
4. \(\begin{align} 5ab+5b-8&=5.a.b+5.b-8 \text{ [met a = -5 en b = 1]}\\&=5.(-5).1+5.1-8\\&=-28\\ \end{align}\)
5. \(\begin{align} 7a+b&=7.a+1.b \text{ [met a = 2 en b = -5]}\\&=7.2+1.(-5)\\&=9\\ \end{align}\)
6. \(\begin{align} 4a^2-b&=4.a^2-1.b \text{ [met a = -2 en b = 3]}\\&=4.(-2)^2-1.3\\&=13\\ \end{align}\)
7. \(\begin{align} 3ab+5b+10&=3.a.b+5.b+10 \text{ [met a = -4 en b = 2]}\\&=3.(-4).2+5.2+10\\&=-4\\ \end{align}\)
8. \(\begin{align} 5ab+b-14&=5.a.b+1.b-14 \text{ [met a = -2 en b = -3]}\\&=5.(-2).(-3)+1.(-3)-14\\&=13\\ \end{align}\)
9. \(\begin{align} 3a^2+3b&=3.a^2+3.b \text{ [met a = -5 en b = -2]}\\&=3.(-5)^2+3.(-2)\\&=69\\ \end{align}\)
10. \(\begin{align} 3ab-3b-15&=3.a.b-3.b-15 \text{ [met a = 6 en b = 5]}\\&=3.6.5-3.5-15\\&=60\\ \end{align}\)
11. \(\begin{align} 2ab-b-3&=2.a.b-1.b-3 \text{ [met a = 1 en b = 4]}\\&=2.1.4-1.4-3\\&=1\\ \end{align}\)
12. \(\begin{align} 9a+b&=9.a+1.b \text{ [met a = -1 en b = -2]}\\&=9.(-1)+1.(-2)\\&=-11\\ \end{align}\)