math

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1)Which values of x are in the solution set
y=3x-1
y=x^2-5x+6

2)6ab (radical8b)-3a radical(32b^3)+9ab (radical5b)

3) write in simplest form (2/x+4/y)/(4x/y-y/x)

4)solve for all values of x
8x^3+4x^2-18x-9

5)abs(4x+6)-4x=-10

6) simplify 4x^-5y7 /(3x^3y^-8)^-3

  • math -

    1) set the two equations equal to each other:
    3x-1 = x^2-5x+6

    Combine like terms:
    x^2-8x+7 = 0

    Factor:
    (x-1)(x-7)=0

    x = 1, 7

  • math -

    2)
    6ab√8b - 3a√32b^3 + 9ab√5b
    = 6ab*2√2b - 3a(4b√2b) + 9ab√5b
    = 12ab√2b - 12ab√2b + 9ab√5b
    = 9ab√5b

    3)
    (2/x+4/y)/(4x/y-y/x)
    = (2y+4x)/xy / (4x^2 - y^2)/xy
    = (y+2x)/(2x-y)(2x+y)
    = 1/(2x-y)

    4)
    8x^3 + 4x^2 - 18x - 9
    = (2x+3)(2x-3)(2x+1)
    x = -3/2, -1/2, 3/2

    5)
    |4x+6| - 4x = -10

    If 4x+6 >= 0, |4x+6| = 4x+6 and you have
    4x+6 - 4x = 10
    6 = 10
    no solutions there

    If 4x+6 < 0, |4x+6| = -(4x+6) and you have
    -4x-6 - 4x = 10
    -8x = 16
    x = -2
    But, if x = -2, 4x+6 > 0, so no solution there
    no solutions there

    6)
    4x^-5 y^7 /(3x^3 y^-8)^-3
    4x^-5 y^7 * (3x^3 y^-8)^3
    4x^-5 y^7 * 27x^9 y^-24
    108x^4 y^-17
    or, 108x^4/y^17

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