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anonymous

  • 5 years ago

pefrom the indicated operation. wirte the result in the from atbi: (7+9i)(7-9i)

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  1. anonymous
    • 5 years ago
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    corecction a+bi

  2. watchmath
    • 5 years ago
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    Using the identity that \((a+b)(a-b)=a^2-b^2\) we simplify the expression into \(7^2-(9i)^2=49+81=130\)

  3. anonymous
    • 5 years ago
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    \[(7+9i)(7-9i)=49+81=130\]

  4. anonymous
    • 5 years ago
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    a bag of battiries contains 5 batteries which are all the same size and equally selected. each battery is a different brand. if u selected 4 at ramdom. use the wingspaning pricinclple to determine how many points will be in the sample space with or without?

  5. anonymous
    • 5 years ago
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    You beat me to it watchmath :)

  6. anonymous
    • 5 years ago
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    factor by grouping: 6st+21t-10s-35

  7. anonymous
    • 5 years ago
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    \[6st+21t-10s-35=(6st-10s)+(21t-35) =2s(3t-5)+7(3t-5)\] \[=(3t-5)(2s+7)\]

  8. anonymous
    • 5 years ago
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    x=√4x+12 solve √=this is a square root sign

  9. anonymous
    • 5 years ago
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    how do i give medals. id give you a milllion

  10. anonymous
    • 5 years ago
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    Subtract 12 from both sides, and then square both sides.

  11. anonymous
    • 5 years ago
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    Lol. Press on "Good Answer"

  12. anonymous
    • 5 years ago
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    i cant find it!

  13. anonymous
    • 5 years ago
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    \[x=\sqrt{4x}+12 \implies (x-12)^2=4x \implies x^2-24x+144-4x=0\] \[\implies x^2-28x+144=0\] Now, use the quadratic formula to solve the equation.

  14. anonymous
    • 5 years ago
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    found the buttoN! lol

  15. anonymous
    • 5 years ago
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    given f(x)=x^2-4x-6, find f(2)

  16. anonymous
    • 5 years ago
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    \[f(x)=x^2-4x-6 \implies f(2)=2^2-4(2)-6=4-8-6=-10\]

  17. anonymous
    • 5 years ago
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    perform the indicated operation and simplify: 3/t+5/r-6 the division sign means over

  18. anonymous
    • 5 years ago
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    Are you sure about the expression?

  19. anonymous
    • 5 years ago
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    oh sorry its 3/r + 5/r-6

  20. watchmath
    • 5 years ago
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    \(\frac{3(r-6)}{r(r-6)}+\frac{5r}{r(r-6)}=\frac{8r-18}{r(r-6)}\)

  21. anonymous
    • 5 years ago
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    simplify and add or subratct wherever possible: √3-6√12=4√192

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