Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} a^2-6b&=1.a^2-6.b \text{ [met a = -4 en b = -5]}\\&=1.(-4)^2-6.(-5)\\&=46\\ \end{align}\)
2. \(\begin{align} 3ab+5b-1&=3.a.b+5.b-1 \text{ [met a = -2 en b = 4]}\\&=3.(-2).4+5.4-1\\&=-5\\ \end{align}\)
3. \(\begin{align} 10a+9b&=10.a+9.b \text{ [met a = 5 en b = 5]}\\&=10.5+9.5\\&=95\\ \end{align}\)
4. \(\begin{align} ab+3b-12&=1.a.b+3.b-12 \text{ [met a = 6 en b = -1]}\\&=1.6.(-1)+3.(-1)-12\\&=-21\\ \end{align}\)
5. \(\begin{align} 6a+3b&=6.a+3.b \text{ [met a = -2 en b = -1]}\\&=6.(-2)+3.(-1)\\&=-15\\ \end{align}\)
6. \(\begin{align} 2a^2+4b&=2.a^2+4.b \text{ [met a = -3 en b = 6]}\\&=2.(-3)^2+4.6\\&=42\\ \end{align}\)
7. \(\begin{align} 5ab-2b-15&=5.a.b-2.b-15 \text{ [met a = -3 en b = 5]}\\&=5.(-3).5-2.5-15\\&=-100\\ \end{align}\)
8. \(\begin{align} 2a-7b&=2.a-7.b \text{ [met a = 4 en b = -5]}\\&=2.4-7.(-5)\\&=43\\ \end{align}\)
9. \(\begin{align} 2a^2+5b&=2.a^2+5.b \text{ [met a = -4 en b = 4]}\\&=2.(-4)^2+5.4\\&=52\\ \end{align}\)
10. \(\begin{align} 2a^2+6b&=2.a^2+6.b \text{ [met a = -3 en b = -4]}\\&=2.(-3)^2+6.(-4)\\&=-6\\ \end{align}\)
11. \(\begin{align} 5ab+4b-5&=5.a.b+4.b-5 \text{ [met a = 4 en b = 2]}\\&=5.4.2+4.2-5\\&=43\\ \end{align}\)
12. \(\begin{align} 9a-4b&=9.a-4.b \text{ [met a = 2 en b = 2]}\\&=9.2-4.2\\&=10\\ \end{align}\)