Lettervormen getalwaarde

Hoofdmenu Eentje per keer  🖨

Bereken de getalwaarde

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

---

Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 3a^2-5b&=3.a^2-5.b \text{ [met a = 2 en b = -3]}\\&=3.2^2-5.(-3)\\&=27\\ \end{align}\)
2. \(\begin{align} 5a^2+4b&=5.a^2+4.b \text{ [met a = -3 en b = -5]}\\&=5.(-3)^2+4.(-5)\\&=25\\ \end{align}\)
3. \(\begin{align} a^2-b&=1.a^2-1.b \text{ [met a = 3 en b = 2]}\\&=1.3^2-1.2\\&=7\\ \end{align}\)
4. \(\begin{align} 4ab-4b+2&=4.a.b-4.b+2 \text{ [met a = -4 en b = 3]}\\&=4.(-4).3-4.3+2\\&=-58\\ \end{align}\)
5. \(\begin{align} 3ab+2b+3&=3.a.b+2.b+3 \text{ [met a = 3 en b = 2]}\\&=3.3.2+2.2+3\\&=25\\ \end{align}\)
6. \(\begin{align} 3a^2-4b&=3.a^2-4.b \text{ [met a = -3 en b = -5]}\\&=3.(-3)^2-4.(-5)\\&=47\\ \end{align}\)
7. \(\begin{align} 5ab-2b+4&=5.a.b-2.b+4 \text{ [met a = 1 en b = 2]}\\&=5.1.2-2.2+4\\&=10\\ \end{align}\)
8. \(\begin{align} 8a+8b&=8.a+8.b \text{ [met a = 1 en b = 2]}\\&=8.1+8.2\\&=24\\ \end{align}\)
9. \(\begin{align} 4ab+5b+3&=4.a.b+5.b+3 \text{ [met a = -3 en b = -2]}\\&=4.(-3).(-2)+5.(-2)+3\\&=17\\ \end{align}\)
10. \(\begin{align} 5a^2-5b&=5.a^2-5.b \text{ [met a = 5 en b = 4]}\\&=5.5^2-5.4\\&=105\\ \end{align}\)
11. \(\begin{align} 3a+3b&=3.a+3.b \text{ [met a = 2 en b = 1]}\\&=3.2+3.1\\&=9\\ \end{align}\)
12. \(\begin{align} 6a-3b&=6.a-3.b \text{ [met a = 1 en b = 2]}\\&=6.1-3.2\\&=0\\ \end{align}\)