Respuesta :

Question:

Find the value of 3a + 2b if a = 4 and b = (-9) .

Solution:

Let the following expression

[tex]3a\text{ + 2b}[/tex]

now, if a = 4 and b = -9, and we substitute them in the previous expression, we obtain:

[tex]3(4)\text{ + 2(-9) = 12 - 18 = -6}[/tex]

then, we can conclude that the correct answer is:

[tex]-6[/tex]