Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 3a^2-2b&=3.a^2-2.b \text{ [met a = -4 en b = -2]}\\&=3.(-4)^2-2.(-2)\\&=52\\ \end{align}\)
2. \(\begin{align} 2ab+b+10&=2.a.b+1.b+10 \text{ [met a = 2 en b = 5]}\\&=2.2.5+1.5+10\\&=35\\ \end{align}\)
3. \(\begin{align} 4a^2+b&=4.a^2+1.b \text{ [met a = -4 en b = 1]}\\&=4.(-4)^2+1.1\\&=65\\ \end{align}\)
4. \(\begin{align} 4a^2+5b&=4.a^2+5.b \text{ [met a = 3 en b = 3]}\\&=4.3^2+5.3\\&=51\\ \end{align}\)
5. \(\begin{align} 7a+3b&=7.a+3.b \text{ [met a = 1 en b = 5]}\\&=7.1+3.5\\&=22\\ \end{align}\)
6. \(\begin{align} 3a^2+b&=3.a^2+1.b \text{ [met a = 2 en b = 6]}\\&=3.2^2+1.6\\&=18\\ \end{align}\)
7. \(\begin{align} 2a^2+5b&=2.a^2+5.b \text{ [met a = 5 en b = 6]}\\&=2.5^2+5.6\\&=80\\ \end{align}\)
8. \(\begin{align} 4ab-b+10&=4.a.b-1.b+10 \text{ [met a = -2 en b = -5]}\\&=4.(-2).(-5)-1.(-5)+10\\&=55\\ \end{align}\)
9. \(\begin{align} 4ab+3b-15&=4.a.b+3.b-15 \text{ [met a = 5 en b = 2]}\\&=4.5.2+3.2-15\\&=31\\ \end{align}\)
10. \(\begin{align} 10a-8b&=10.a-8.b \text{ [met a = -1 en b = -1]}\\&=10.(-1)-8.(-1)\\&=-2\\ \end{align}\)
11. \(\begin{align} ab+5b-2&=1.a.b+5.b-2 \text{ [met a = -4 en b = 5]}\\&=1.(-4).5+5.5-2\\&=3\\ \end{align}\)
12. \(\begin{align} 2a^2-6b&=2.a^2-6.b \text{ [met a = -3 en b = 4]}\\&=2.(-3)^2-6.4\\&=-6\\ \end{align}\)