Lettervormen getalwaarde

Bereken de getalwaarde

\(3ab+5b-6\text{ [met a = 2 en b = 3]}\)

\(\begin{align} 3ab+5b-6&=3.a.b+5.b-6 \text{ [met a = 2 en b = 3]}\\&=3.2.3+5.3-6\\&=27\\ \end{align}\)