Question 151302: a rectangle has length x+5 and width x-7. Find the area, A, of the rectangle in terms of x.
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! a rectangle has length x+5 and width x-7. Find the area, A, of the rectangle in terms of x.
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Since we know that for any rectangle:
area = length * width
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The problem gives us:
length = (x+5)
width = (x-7)
area = A
.
Plug the above into:
area = length * width
A = (x+5)(x-7)
Applying "FOIL" to the right side:
A = x^2 - 7x + 5x - 35
A = x^2 - 2x- 35 (this is what they are looking for)
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