math/209

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Mike would like to enlarge his rectangular front yard which is currently 80 feet by 40 feet. He can only extend the width and length by 5x feet. If x = 7 feet, what will be the increase in area of the front yard?



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  • math/209 -

    I am wonder what width and length means..is that the sum, or each?

    I will assume it is each width and length.

    80+5x)(40+5x)= 80*40+200x+400x+25x^2
    but this is an INCREASE of

    600x+25x^2 or you do it for x=7

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