Answer :
Given for a rectangle:
The length = x + 6
The width = x - 4
The area of the rectangle = length times width
So, the expression in terms of x will be:
[tex]\begin{gathered} A=(x+6)(x-4) \\ A=x\cdot(x-4)+6\cdot(x-4) \\ A=x^2-4x+6x-24 \\ \\ \\ A=x^2+2x-24 \end{gathered}[/tex]