Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(2a^2+3b\text{ [met a = 4 en b = -3]}\)
2. \(10a+6b\text{ [met a = -4 en b = 2]}\)
3. \(4ab+3b-8\text{ [met a = 1 en b = -4]}\)
4. \(3a^2-6b\text{ [met a = 1 en b = 6]}\)
5. \(8a-10b\text{ [met a = -5 en b = -3]}\)
6. \(2a^2+b\text{ [met a = -1 en b = -2]}\)
7. \(5ab+2b-15\text{ [met a = 1 en b = -4]}\)
8. \(3ab+4b+13\text{ [met a = -4 en b = -3]}\)
9. \(2a-b\text{ [met a = 4 en b = 1]}\)
10. \(3a^2+b\text{ [met a = 1 en b = -3]}\)
11. \(3a-3b\text{ [met a = 5 en b = -4]}\)
12. \(2ab+5b+12\text{ [met a = 3 en b = -1]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2a^2+3b&=2.a^2+3.b \text{ [met a = 4 en b = -3]}\\&=2.4^2+3.(-3)\\&=23\\ \end{align}\)
2. \(\begin{align} 10a+6b&=10.a+6.b \text{ [met a = -4 en b = 2]}\\&=10.(-4)+6.2\\&=-28\\ \end{align}\)
3. \(\begin{align} 4ab+3b-8&=4.a.b+3.b-8 \text{ [met a = 1 en b = -4]}\\&=4.1.(-4)+3.(-4)-8\\&=-36\\ \end{align}\)
4. \(\begin{align} 3a^2-6b&=3.a^2-6.b \text{ [met a = 1 en b = 6]}\\&=3.1^2-6.6\\&=-33\\ \end{align}\)
5. \(\begin{align} 8a-10b&=8.a-10.b \text{ [met a = -5 en b = -3]}\\&=8.(-5)-10.(-3)\\&=-10\\ \end{align}\)
6. \(\begin{align} 2a^2+b&=2.a^2+1.b \text{ [met a = -1 en b = -2]}\\&=2.(-1)^2+1.(-2)\\&=0\\ \end{align}\)
7. \(\begin{align} 5ab+2b-15&=5.a.b+2.b-15 \text{ [met a = 1 en b = -4]}\\&=5.1.(-4)+2.(-4)-15\\&=-43\\ \end{align}\)
8. \(\begin{align} 3ab+4b+13&=3.a.b+4.b+13 \text{ [met a = -4 en b = -3]}\\&=3.(-4).(-3)+4.(-3)+13\\&=37\\ \end{align}\)
9. \(\begin{align} 2a-b&=2.a-1.b \text{ [met a = 4 en b = 1]}\\&=2.4-1.1\\&=7\\ \end{align}\)
10. \(\begin{align} 3a^2+b&=3.a^2+1.b \text{ [met a = 1 en b = -3]}\\&=3.1^2+1.(-3)\\&=0\\ \end{align}\)
11. \(\begin{align} 3a-3b&=3.a-3.b \text{ [met a = 5 en b = -4]}\\&=3.5-3.(-4)\\&=27\\ \end{align}\)
12. \(\begin{align} 2ab+5b+12&=2.a.b+5.b+12 \text{ [met a = 3 en b = -1]}\\&=2.3.(-1)+5.(-1)+12\\&=1\\ \end{align}\)