anonymous
  • anonymous
pefrom the indicated operation. wirte the result in the from atbi: (7+9i)(7-9i)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
corecction a+bi
watchmath
  • watchmath
Using the identity that \((a+b)(a-b)=a^2-b^2\) we simplify the expression into \(7^2-(9i)^2=49+81=130\)
anonymous
  • anonymous
\[(7+9i)(7-9i)=49+81=130\]

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anonymous
  • anonymous
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?
anonymous
  • anonymous
You beat me to it watchmath :)
anonymous
  • anonymous
factor by grouping: 6st+21t-10s-35
anonymous
  • anonymous
\[6st+21t-10s-35=(6st-10s)+(21t-35) =2s(3t-5)+7(3t-5)\] \[=(3t-5)(2s+7)\]
anonymous
  • anonymous
x=√4x+12 solve √=this is a square root sign
anonymous
  • anonymous
how do i give medals. id give you a milllion
anonymous
  • anonymous
Subtract 12 from both sides, and then square both sides.
anonymous
  • anonymous
Lol. Press on "Good Answer"
anonymous
  • anonymous
i cant find it!
anonymous
  • anonymous
\[x=\sqrt{4x}+12 \implies (x-12)^2=4x \implies x^2-24x+144-4x=0\] \[\implies x^2-28x+144=0\] Now, use the quadratic formula to solve the equation.
anonymous
  • anonymous
found the buttoN! lol
anonymous
  • anonymous
given f(x)=x^2-4x-6, find f(2)
anonymous
  • anonymous
\[f(x)=x^2-4x-6 \implies f(2)=2^2-4(2)-6=4-8-6=-10\]
anonymous
  • anonymous
perform the indicated operation and simplify: 3/t+5/r-6 the division sign means over
anonymous
  • anonymous
Are you sure about the expression?
anonymous
  • anonymous
oh sorry its 3/r + 5/r-6
watchmath
  • watchmath
\(\frac{3(r-6)}{r(r-6)}+\frac{5r}{r(r-6)}=\frac{8r-18}{r(r-6)}\)
anonymous
  • anonymous
simplify and add or subratct wherever possible: √3-6√12=4√192

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