Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(a^2+3b\text{ [met a = -2 en b = -3]}\)
2. \(a+3b\text{ [met a = 3 en b = -1]}\)
3. \(6a-10b\text{ [met a = -5 en b = 2]}\)
4. \(5ab-4b+13\text{ [met a = -2 en b = 2]}\)
5. \(ab+3b+6\text{ [met a = -5 en b = -3]}\)
6. \(3ab+3b+11\text{ [met a = 5 en b = -5]}\)
7. \(5ab+4b-4\text{ [met a = 4 en b = 6]}\)
8. \(9a+3b\text{ [met a = -2 en b = -1]}\)
9. \(4a^2+2b\text{ [met a = 6 en b = 1]}\)
10. \(4ab-2b-14\text{ [met a = 2 en b = -1]}\)
11. \(a-2b\text{ [met a = -4 en b = 3]}\)
12. \(4ab-5b+12\text{ [met a = 2 en b = 1]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} a^2+3b&=1.a^2+3.b \text{ [met a = -2 en b = -3]}\\&=1.(-2)^2+3.(-3)\\&=-5\\ \end{align}\)
2. \(\begin{align} a+3b&=1.a+3.b \text{ [met a = 3 en b = -1]}\\&=1.3+3.(-1)\\&=0\\ \end{align}\)
3. \(\begin{align} 6a-10b&=6.a-10.b \text{ [met a = -5 en b = 2]}\\&=6.(-5)-10.2\\&=-50\\ \end{align}\)
4. \(\begin{align} 5ab-4b+13&=5.a.b-4.b+13 \text{ [met a = -2 en b = 2]}\\&=5.(-2).2-4.2+13\\&=-15\\ \end{align}\)
5. \(\begin{align} ab+3b+6&=1.a.b+3.b+6 \text{ [met a = -5 en b = -3]}\\&=1.(-5).(-3)+3.(-3)+6\\&=12\\ \end{align}\)
6. \(\begin{align} 3ab+3b+11&=3.a.b+3.b+11 \text{ [met a = 5 en b = -5]}\\&=3.5.(-5)+3.(-5)+11\\&=-79\\ \end{align}\)
7. \(\begin{align} 5ab+4b-4&=5.a.b+4.b-4 \text{ [met a = 4 en b = 6]}\\&=5.4.6+4.6-4\\&=140\\ \end{align}\)
8. \(\begin{align} 9a+3b&=9.a+3.b \text{ [met a = -2 en b = -1]}\\&=9.(-2)+3.(-1)\\&=-21\\ \end{align}\)
9. \(\begin{align} 4a^2+2b&=4.a^2+2.b \text{ [met a = 6 en b = 1]}\\&=4.6^2+2.1\\&=146\\ \end{align}\)
10. \(\begin{align} 4ab-2b-14&=4.a.b-2.b-14 \text{ [met a = 2 en b = -1]}\\&=4.2.(-1)-2.(-1)-14\\&=-20\\ \end{align}\)
11. \(\begin{align} a-2b&=1.a-2.b \text{ [met a = -4 en b = 3]}\\&=1.(-4)-2.3\\&=-10\\ \end{align}\)
12. \(\begin{align} 4ab-5b+12&=4.a.b-5.b+12 \text{ [met a = 2 en b = 1]}\\&=4.2.1-5.1+12\\&=15\\ \end{align}\)