11th grade

20xsquared+40 x+15=0

asked by bob
  1. factor out 5
    u get
    5(4x^2+8x +3) = 0
    5(4x^2+2x+6x+3)=0
    5(2x(2x+1)+3(2x+1))=0
    5(2x+1)(2x+3)=0
    x=-1/2
    or
    x=-3/2

    posted by chemistry

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