Answer:
[tex]12x^2+9x[/tex]
Step-by-step explanation:
The formula of the area of a triangle is [tex]\frac{bh}{2}[/tex]. Plugging in the given base and height values, you get [tex]\frac{(4x+3)(6x)}{2}=\frac{24x^2+18x}{2}=12x^2+9x[/tex]. Hope this helps!