Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} a+9b&=1.a+9.b \text{ [met a = -2 en b = -3]}\\&=1.(-2)+9.(-3)\\&=-29\\ \end{align}\)
2. \(\begin{align} a+8b&=1.a+8.b \text{ [met a = -4 en b = -3]}\\&=1.(-4)+8.(-3)\\&=-28\\ \end{align}\)
3. \(\begin{align} 4a^2-b&=4.a^2-1.b \text{ [met a = -5 en b = 6]}\\&=4.(-5)^2-1.6\\&=94\\ \end{align}\)
4. \(\begin{align} 5a^2+6b&=5.a^2+6.b \text{ [met a = 2 en b = 3]}\\&=5.2^2+6.3\\&=38\\ \end{align}\)
5. \(\begin{align} 4a^2+4b&=4.a^2+4.b \text{ [met a = 5 en b = -4]}\\&=4.5^2+4.(-4)\\&=84\\ \end{align}\)
6. \(\begin{align} 3ab+b+6&=3.a.b+1.b+6 \text{ [met a = 1 en b = -2]}\\&=3.1.(-2)+1.(-2)+6\\&=-2\\ \end{align}\)
7. \(\begin{align} 3ab-4b-1&=3.a.b-4.b-1 \text{ [met a = -4 en b = -4]}\\&=3.(-4).(-4)-4.(-4)-1\\&=63\\ \end{align}\)
8. \(\begin{align} 9a+3b&=9.a+3.b \text{ [met a = -2 en b = -4]}\\&=9.(-2)+3.(-4)\\&=-30\\ \end{align}\)
9. \(\begin{align} 4a+6b&=4.a+6.b \text{ [met a = -3 en b = -1]}\\&=4.(-3)+6.(-1)\\&=-18\\ \end{align}\)
10. \(\begin{align} 2a^2-5b&=2.a^2-5.b \text{ [met a = 6 en b = 3]}\\&=2.6^2-5.3\\&=57\\ \end{align}\)
11. \(\begin{align} 2a+b&=2.a+1.b \text{ [met a = -1 en b = -2]}\\&=2.(-1)+1.(-2)\\&=-4\\ \end{align}\)
12. \(\begin{align} 7a-6b&=7.a-6.b \text{ [met a = 3 en b = 1]}\\&=7.3-6.1\\&=15\\ \end{align}\)