Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} a+4b&=1.a+4.b \text{ [met a = -4 en b = -4]}\\&=1.(-4)+4.(-4)\\&=-20\\ \end{align}\)
2. \(\begin{align} 10a+4b&=10.a+4.b \text{ [met a = -2 en b = -2]}\\&=10.(-2)+4.(-2)\\&=-28\\ \end{align}\)
3. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = 5 en b = 6]}\\&=2.5^2+3.6\\&=68\\ \end{align}\)
4. \(\begin{align} 5a^2-2b&=5.a^2-2.b \text{ [met a = 1 en b = -2]}\\&=5.1^2-2.(-2)\\&=9\\ \end{align}\)
5. \(\begin{align} 5ab+2b+2&=5.a.b+2.b+2 \text{ [met a = 6 en b = -5]}\\&=5.6.(-5)+2.(-5)+2\\&=-158\\ \end{align}\)
6. \(\begin{align} 6a-4b&=6.a-4.b \text{ [met a = 1 en b = 1]}\\&=6.1-4.1\\&=2\\ \end{align}\)
7. \(\begin{align} a^2+6b&=1.a^2+6.b \text{ [met a = -5 en b = 2]}\\&=1.(-5)^2+6.2\\&=37\\ \end{align}\)
8. \(\begin{align} 7a-9b&=7.a-9.b \text{ [met a = -3 en b = 3]}\\&=7.(-3)-9.3\\&=-48\\ \end{align}\)
9. \(\begin{align} 5ab+5b-13&=5.a.b+5.b-13 \text{ [met a = -4 en b = 1]}\\&=5.(-4).1+5.1-13\\&=-28\\ \end{align}\)
10. \(\begin{align} a^2+b&=1.a^2+1.b \text{ [met a = -5 en b = -5]}\\&=1.(-5)^2+1.(-5)\\&=20\\ \end{align}\)
11. \(\begin{align} 2a^2+b&=2.a^2+1.b \text{ [met a = -4 en b = 4]}\\&=2.(-4)^2+1.4\\&=36\\ \end{align}\)
12. \(\begin{align} 4ab+4b-3&=4.a.b+4.b-3 \text{ [met a = 4 en b = 4]}\\&=4.4.4+4.4-3\\&=77\\ \end{align}\)