The width of a rectangle is 6 inches less than it’s length, and the area is 7 square inches. What are the length and width of the rectangle

Question

The width of a rectangle is 6 inches less than it’s length, and the area is 7 square inches. What are the length and width of the rectangle

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Sophia 2 weeks 2021-09-11T00:45:13+00:00 2 Answers 0

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    0
    2021-09-11T00:46:27+00:00

    Answer:

    So length is 7 in while width is 1 in.

    Step-by-step explanation:

    We are given W is 6 inches less than L which mean as an equation we have W=L-6.

    We are given the area of this rectangle, LW=7.

    So we have the system:

    W=L-6

    LW=7.

    Replace the second W with what the first W equals:

    LW=7

    L(L-6)=7

    Distribute:

    L^2-6L=7

    Subtract 7 on both sides:

    L^2-6L-7=0

    We are luck since the coefficient of L^2 is 1.  This means all we have to do is find two numbers that multiply to be -7 add at the same time add up to -6.

    Those numbers are -7 and 1 since (-7)(1)=-7 and (-7)+(1)=-6.

    So the factored form of our equation is:

    (L-7)(L+1)=0

    This gives us two equations to solve:

    L-7=0  or L+1=0

    L=7     or L=-1

    L=-1 doesn’t make sense for a length so L=7.

    L=7 means the length is 7 inches.

    If W=L-6 and L=7, then W=7-6=1.

    The width is 1 inch since W=1.

    So length is 7 in while width is 1 in.

    0
    2021-09-11T00:46:34+00:00

    W is the width, L is the length.
    W=L-6) because the width is 6 less than the length. Since area is LxW, this is represented by 7= L(L-6)
    So 7 = L^2-6L and then subtract 7 to get the quadratic equation L^2-6L-7
    And this factors out to (L-7)(L+1): L=7,-1 but length can’t be negative so the length is 7. To find the width you do (7-6) which is 1, so the length is 7 and the width is 1.

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