Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2a-b&=2.a-1.b \text{ [met a = 5 en b = 3]}\\&=2.5-1.3\\&=7\\ \end{align}\)
2. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = -3 en b = -3]}\\&=2.(-3)^2+3.(-3)\\&=9\\ \end{align}\)
3. \(\begin{align} a^2+b&=1.a^2+1.b \text{ [met a = -4 en b = -4]}\\&=1.(-4)^2+1.(-4)\\&=12\\ \end{align}\)
4. \(\begin{align} 5a-7b&=5.a-7.b \text{ [met a = 3 en b = -3]}\\&=5.3-7.(-3)\\&=36\\ \end{align}\)
5. \(\begin{align} ab-5b-6&=1.a.b-5.b-6 \text{ [met a = 6 en b = 5]}\\&=1.6.5-5.5-6\\&=-1\\ \end{align}\)
6. \(\begin{align} ab+5b+14&=1.a.b+5.b+14 \text{ [met a = 1 en b = -5]}\\&=1.1.(-5)+5.(-5)+14\\&=-16\\ \end{align}\)
7. \(\begin{align} 4a^2-3b&=4.a^2-3.b \text{ [met a = 4 en b = -4]}\\&=4.4^2-3.(-4)\\&=76\\ \end{align}\)
8. \(\begin{align} a^2-b&=1.a^2-1.b \text{ [met a = 5 en b = -3]}\\&=1.5^2-1.(-3)\\&=28\\ \end{align}\)
9. \(\begin{align} 5ab-2b-2&=5.a.b-2.b-2 \text{ [met a = -2 en b = 1]}\\&=5.(-2).1-2.1-2\\&=-14\\ \end{align}\)
10. \(\begin{align} 4a^2+4b&=4.a^2+4.b \text{ [met a = 4 en b = 3]}\\&=4.4^2+4.3\\&=76\\ \end{align}\)
11. \(\begin{align} 4ab+4b-11&=4.a.b+4.b-11 \text{ [met a = 6 en b = -4]}\\&=4.6.(-4)+4.(-4)-11\\&=-123\\ \end{align}\)
12. \(\begin{align} 3ab-b-11&=3.a.b-1.b-11 \text{ [met a = 1 en b = 2]}\\&=3.1.2-1.2-11\\&=-7\\ \end{align}\)