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Us the area formula with l = 5x-4 and w=2x+3.
A=10x^2+7x-12
Recall that to find the area of a rectangle we need to multiply the length and the width. Let's use l = 5x-4 and w=2x+3 from the image.
l= 5x-4, w= 2x+3
Distribute 2x+3
Distribute 5x
Distribute -4
Subtract terms