Math

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We are studying polynomials

(x+3)(x-7)=0

2x^2+3x-9=0

5x^2+2x=0

  • Math -

    x = - 3 or x = 7 makes the left zero.
    ====================
    factors of 2 are 1 and 2
    factors of 9 are 1, 9, 3
    need combination that differs by 3
    well 2 * 3 and 3 will work
    (2 x - 3) (x+3) = 0
    x = 3/2 or x = -3 makes the left zero
    ========================
    now really try them first yourself
    x (5 x + 2) = 0
    x = 0 or x = -2/5 makes it zero

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