Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 4ab+3b-12&=4.a.b+3.b-12 \text{ [met a = 6 en b = -1]}\\&=4.6.(-1)+3.(-1)-12\\&=-39\\ \end{align}\)
2. \(\begin{align} 4a-6b&=4.a-6.b \text{ [met a = 2 en b = -2]}\\&=4.2-6.(-2)\\&=20\\ \end{align}\)
3. \(\begin{align} 10a+5b&=10.a+5.b \text{ [met a = -3 en b = -2]}\\&=10.(-3)+5.(-2)\\&=-40\\ \end{align}\)
4. \(\begin{align} 4a^2-4b&=4.a^2-4.b \text{ [met a = 4 en b = -3]}\\&=4.4^2-4.(-3)\\&=76\\ \end{align}\)
5. \(\begin{align} 4a^2-6b&=4.a^2-6.b \text{ [met a = 2 en b = -2]}\\&=4.2^2-6.(-2)\\&=28\\ \end{align}\)
6. \(\begin{align} 3a+4b&=3.a+4.b \text{ [met a = 1 en b = -4]}\\&=3.1+4.(-4)\\&=-13\\ \end{align}\)
7. \(\begin{align} 3ab-4b-12&=3.a.b-4.b-12 \text{ [met a = -4 en b = -2]}\\&=3.(-4).(-2)-4.(-2)-12\\&=20\\ \end{align}\)
8. \(\begin{align} 5a^2-2b&=5.a^2-2.b \text{ [met a = 5 en b = -3]}\\&=5.5^2-2.(-3)\\&=131\\ \end{align}\)
9. \(\begin{align} 4a^2-b&=4.a^2-1.b \text{ [met a = -5 en b = 2]}\\&=4.(-5)^2-1.2\\&=98\\ \end{align}\)
10. \(\begin{align} 8a-10b&=8.a-10.b \text{ [met a = 5 en b = 5]}\\&=8.5-10.5\\&=-10\\ \end{align}\)
11. \(\begin{align} 3a-3b&=3.a-3.b \text{ [met a = 5 en b = -1]}\\&=3.5-3.(-1)\\&=18\\ \end{align}\)
12. \(\begin{align} a^2-2b&=1.a^2-2.b \text{ [met a = 2 en b = 4]}\\&=1.2^2-2.4\\&=-4\\ \end{align}\)