Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 3a^2-6b&=3.a^2-6.b \text{ [met a = -2 en b = -3]}\\&=3.(-2)^2-6.(-3)\\&=30\\ \end{align}\)
2. \(\begin{align} 2ab-5b-1&=2.a.b-5.b-1 \text{ [met a = 5 en b = -5]}\\&=2.5.(-5)-5.(-5)-1\\&=-26\\ \end{align}\)
3. \(\begin{align} 8a-4b&=8.a-4.b \text{ [met a = 4 en b = 4]}\\&=8.4-4.4\\&=16\\ \end{align}\)
4. \(\begin{align} a^2-5b&=1.a^2-5.b \text{ [met a = 5 en b = 1]}\\&=1.5^2-5.1\\&=20\\ \end{align}\)
5. \(\begin{align} a+4b&=1.a+4.b \text{ [met a = 3 en b = 5]}\\&=1.3+4.5\\&=23\\ \end{align}\)
6. \(\begin{align} a^2+b&=1.a^2+1.b \text{ [met a = 4 en b = 1]}\\&=1.4^2+1.1\\&=17\\ \end{align}\)
7. \(\begin{align} 9a-9b&=9.a-9.b \text{ [met a = 5 en b = -4]}\\&=9.5-9.(-4)\\&=81\\ \end{align}\)
8. \(\begin{align} 4ab+3b+8&=4.a.b+3.b+8 \text{ [met a = 1 en b = 5]}\\&=4.1.5+3.5+8\\&=43\\ \end{align}\)
9. \(\begin{align} 4ab+4b-3&=4.a.b+4.b-3 \text{ [met a = -5 en b = -1]}\\&=4.(-5).(-1)+4.(-1)-3\\&=13\\ \end{align}\)
10. \(\begin{align} ab+2b-1&=1.a.b+2.b-1 \text{ [met a = 4 en b = 6]}\\&=1.4.6+2.6-1\\&=35\\ \end{align}\)
11. \(\begin{align} 2ab-4b+11&=2.a.b-4.b+11 \text{ [met a = -2 en b = -5]}\\&=2.(-2).(-5)-4.(-5)+11\\&=51\\ \end{align}\)
12. \(\begin{align} ab-3b+12&=1.a.b-3.b+12 \text{ [met a = -5 en b = 6]}\\&=1.(-5).6-3.6+12\\&=-36\\ \end{align}\)