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Thread: Trinomial Question

  1. #1
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    Default Trinomial Question

    So hey guys, this test came up on my test today and am wondering if I did it right:

    An area of a square has the equation of 16x^2 - 24x + 9. Find the perimeter of the square.

    What I did
    Factored the equation into s^2 = A[]

    (4x-3)(4x-3) = 16x2 -12x - 12x + 9 = (4x-3)^2

    Since the perimeter of a square is 4s, am i correct in doing

    (4x-3)(4) = 16x-12

    P = 16x - 12?

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    Quote Originally Posted by Sin View Post
    So hey guys, this test came up on my test today and am wondering if I did it right:

    An area of a square has the equation of 16x^2 - 24x + 9. Find the perimeter of the square.

    What I did
    Factored the equation into s^2 = A[]

    (4x-3)(4x-3) = 16x2 -12x - 12x + 9 = (4x-3)^2

    Since the perimeter of a square is 4s, am i correct in doing

    (4x-3)(4) = 16x-12

    P = 16x - 12?
    You are correct with this method.

    As the area of the square = (4x-3)*(4x-3) where (4x-3) is each side of the square.

    This could also be solved using a multivariate calculus approach, but I'm assuming that's beyond this class.

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    Default

    looks about right, basically Sqr(equ)*4

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