Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 5a^2-3b&=5.a^2-3.b \text{ [met a = -4 en b = -3]}\\&=5.(-4)^2-3.(-3)\\&=89\\ \end{align}\)
2. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = -1 en b = -4]}\\&=2.(-1)^2+3.(-4)\\&=-10\\ \end{align}\)
3. \(\begin{align} 2ab+2b+14&=2.a.b+2.b+14 \text{ [met a = -5 en b = -2]}\\&=2.(-5).(-2)+2.(-2)+14\\&=30\\ \end{align}\)
4. \(\begin{align} 10a-b&=10.a-1.b \text{ [met a = 3 en b = -5]}\\&=10.3-1.(-5)\\&=35\\ \end{align}\)
5. \(\begin{align} 3a^2-b&=3.a^2-1.b \text{ [met a = -4 en b = 6]}\\&=3.(-4)^2-1.6\\&=42\\ \end{align}\)
6. \(\begin{align} 2a^2-6b&=2.a^2-6.b \text{ [met a = 6 en b = -3]}\\&=2.6^2-6.(-3)\\&=90\\ \end{align}\)
7. \(\begin{align} 8a+7b&=8.a+7.b \text{ [met a = 2 en b = 4]}\\&=8.2+7.4\\&=44\\ \end{align}\)
8. \(\begin{align} 9a-4b&=9.a-4.b \text{ [met a = -2 en b = -2]}\\&=9.(-2)-4.(-2)\\&=-10\\ \end{align}\)
9. \(\begin{align} 9a-8b&=9.a-8.b \text{ [met a = -5 en b = 2]}\\&=9.(-5)-8.2\\&=-61\\ \end{align}\)
10. \(\begin{align} 3ab+4b+13&=3.a.b+4.b+13 \text{ [met a = 3 en b = -1]}\\&=3.3.(-1)+4.(-1)+13\\&=0\\ \end{align}\)
11. \(\begin{align} 5a+7b&=5.a+7.b \text{ [met a = -5 en b = -3]}\\&=5.(-5)+7.(-3)\\&=-46\\ \end{align}\)
12. \(\begin{align} 5ab+5b-14&=5.a.b+5.b-14 \text{ [met a = 2 en b = -5]}\\&=5.2.(-5)+5.(-5)-14\\&=-89\\ \end{align}\)