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marmar3000 Group Title

Simplify (4x − 5)^2.

  • one year ago
  • one year ago

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  1. FaisalAyaz Group Title
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    (a+b)^2=a^2 + b^2 + 2ab

    • one year ago
  2. satellite73 Group Title
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    does that mean "multiply"? start with \[(4x+5)(4x+5)\] and do four multiplications

    • one year ago
  3. FaisalAyaz Group Title
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    (a-b)^2 = a^2 + b^2 -2ab

    • one year ago
  4. satellite73 Group Title
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    oops rather \[(4x-5)(4x-5)\]

    • one year ago
  5. marmar3000 Group Title
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    thankss(:

    • one year ago
  6. satellite73 Group Title
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    do four multiplications, combine like terms, and then tell your teacher (gently) that there is nothing "simpler" about your result than there is in \((4x-5)^2\)

    • one year ago
  7. marmar3000 Group Title
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    is it 16x+25?

    • one year ago
  8. satellite73 Group Title
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    oh no! careful here

    • one year ago
  9. satellite73 Group Title
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    four multiplications i will write them out

    • one year ago
  10. satellite73 Group Title
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    \[(4x-5)(4x-5)=4x\times 4x-5\times 4x-5\times 4x+5\times 5\]

    • one year ago
  11. FaisalAyaz Group Title
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    (4x-5)^2 = 16x^2 -40x +25.

    • one year ago
  12. marmar3000 Group Title
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    16x-40x+25?

    • one year ago
  13. satellite73 Group Title
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    then \(4x\times 4x=16x^2\) \(-5\times 4x-5\times 4x=-20x-20x=-40x\) \((-5)\times (-5)=25\) final answer is \[16x^2-40x+25\]

    • one year ago
  14. FaisalAyaz Group Title
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    now factorize it or solve by formula \[x=-b \pm \sqrt{b^{2}-4ac}/2a\]

    • one year ago
  15. FaisalAyaz Group Title
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    no marmar it's 16x^2 - 40x +25. not 16x

    • one year ago
  16. FaisalAyaz Group Title
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    now use quadratic formula or apply factorization method.it's up to u

    • one year ago
  17. FaisalAyaz Group Title
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    U got it marmar? just use formula (a-b)^2 = a^2 + b^2 -2ab. then find x by factorization or quadratic formula.Simple!

    • one year ago
  18. marmar3000 Group Title
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    yea, thanks guys!

    • one year ago
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