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Math Help - 8 algebra 2 questions

  1. #1
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    Smile 8 algebra 2 questions

    hey if you can solve one or all of them it will be much appreciated. Please show all work. thanks!

    (^2=squared)

    solve:

    1: 5x^2+x=-3

    2: 4(x-2)^2=20

    Factor:

    3: 9x^2+15x-36

    write as a complex number in standard form:

    4: 1+3i/3+4i

    complete the square:

    5: x^2-8x+4=0

    find the absolute value:

    6: (2-3i)

    7: write a quadratic function in vertex form, whose graph has the given vertex and passes through the given point:

    vertex: (-6,-7) point (0,-6)

    8: write a quadratic function in intercept form whose graph has the given x-intercepts and passes through the given point:

    x-int: (-2,7) points (8,18)

    these problems are for a take home quiz and i want to make sure i did them 100% correctly.
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  2. #2
    Senior Member vincisonfire's Avatar
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    Number 1 and 2 : don't you know how to solve a quadratic
     x = \frac{-b \pm \sqrt(b^2 - 4ac)}{2a} when
     0 = a\cdot x^2 + b\cdot x + c
    Use this formula to factor degree two polynomials (#3)
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