[tex]\\ \sf\longmapsto Area=LB[/tex]
[tex]\\ \sf\longmapsto Area=(x+4)(x-9)[/tex]
[tex]\\ \sf\longmapsto Area=x(x-9)+4(x-9)[/tex]
[tex]\\ \sf\longmapsto Area=x^2-9x+4x-36[/tex]
[tex]\\ \sf\longmapsto Area=x^2-5x-36[/tex]
Step-by-step explanation:
Solution,
Given:-
Length=x+4
Width=x-9
Now,
By applying the formula for area of rectangle, we get
Area=length×width
Area=(x+4)(x-9)
Area=x(x-9)+4(x-9)
Area=x²-9x+4x-36
Area=x²-5x-36
