Mathematics

Question

In standard form: (x+5)(3x-1)-(x-4)^2

2 Answer

  • I hope this helps you



    x.3x+x.(-1)+5.3x+5.(-1)-(x^2-2.4.x+16)


    3x^2-x+15x-5-x^2+8x-16


    2x^2+22x-21
  • basically, expand
    expand them seperately to reduce confusion
    exponent first
    (x-4)^2=(x-4)(x-4)=x²-4x-4x+16=x²-8x+16

    (x+5)(3x-1)=3x²+15x-x-5=3x²+14x-5

    3x²+14x-5-(x²-8x+16)
    3x²+14x-5-x²+8x-16
    3x²-x²+14x+8x-5-16
    2x²+22x-21

    answer is
    2x²+22x-21
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