Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = -2 en b = 3]}\\&=2.(-2)^2+3.3\\&=17\\ \end{align}\)
2. \(\begin{align} 4a^2-6b&=4.a^2-6.b \text{ [met a = -2 en b = -1]}\\&=4.(-2)^2-6.(-1)\\&=22\\ \end{align}\)
3. \(\begin{align} 10a-b&=10.a-1.b \text{ [met a = 2 en b = -4]}\\&=10.2-1.(-4)\\&=24\\ \end{align}\)
4. \(\begin{align} 6a+6b&=6.a+6.b \text{ [met a = -2 en b = -3]}\\&=6.(-2)+6.(-3)\\&=-30\\ \end{align}\)
5. \(\begin{align} 4a-4b&=4.a-4.b \text{ [met a = -1 en b = 5]}\\&=4.(-1)-4.5\\&=-24\\ \end{align}\)
6. \(\begin{align} 10a+6b&=10.a+6.b \text{ [met a = -5 en b = 1]}\\&=10.(-5)+6.1\\&=-44\\ \end{align}\)
7. \(\begin{align} 4ab+2b+4&=4.a.b+2.b+4 \text{ [met a = 2 en b = 4]}\\&=4.2.4+2.4+4\\&=44\\ \end{align}\)
8. \(\begin{align} 2ab-2b+5&=2.a.b-2.b+5 \text{ [met a = 6 en b = -2]}\\&=2.6.(-2)-2.(-2)+5\\&=-15\\ \end{align}\)
9. \(\begin{align} 8a-7b&=8.a-7.b \text{ [met a = 1 en b = -4]}\\&=8.1-7.(-4)\\&=36\\ \end{align}\)
10. \(\begin{align} 7a+3b&=7.a+3.b \text{ [met a = 3 en b = 5]}\\&=7.3+3.5\\&=36\\ \end{align}\)
11. \(\begin{align} a^2+3b&=1.a^2+3.b \text{ [met a = 3 en b = 2]}\\&=1.3^2+3.2\\&=15\\ \end{align}\)
12. \(\begin{align} ab-b+15&=1.a.b-1.b+15 \text{ [met a = 5 en b = -3]}\\&=1.5.(-3)-1.(-3)+15\\&=3\\ \end{align}\)