Answer:
Formula: [tex]\boxed{\sf{Area = length × width}}[/tex]
Solution:
[tex]\sf{Area = length × width}[/tex]
[tex]\sf{Area = (3x - 5) (x - 4)}[/tex]
[tex]\sf{Area = 3x (x - 4) - 5 (x - 4)}[/tex]
[tex]\sf{Area = 3x² - 12x - 5x + 20}[/tex]
[tex]\boxed{\purple{\sf{Area = 3x² - 17x + 20}}}[/tex]
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