Question

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

Answer 1

corecction a+bi

Answer 2

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

Answer 3

\[(7+9i)(7-9i)=49+81=130\]

Answer 4

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?

Answer 5

You beat me to it watchmath :)

Answer 6

factor by grouping:
6st+21t-10s-35

Answer 7

\[6st+21t-10s-35=(6st-10s)+(21t-35) =2s(3t-5)+7(3t-5)\]
\[=(3t-5)(2s+7)\]

Answer 8

x=√4x+12
solve
√=this is a square root sign

Answer 9

how do i give medals. id give you a milllion

Answer 10

Subtract 12 from both sides, and then square both sides.

Answer 11

Lol. Press on "Good Answer"

Answer 12

i cant find it!

Answer 13

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

Answer 14

found the buttoN! lol

Answer 15

given f(x)=x^2-4x-6, find f(2)

Answer 16

\[f(x)=x^2-4x-6 \implies f(2)=2^2-4(2)-6=4-8-6=-10\]

Answer 17

perform the indicated operation and simplify:
3/t+5/r-6
the division sign means over

Answer 18

Are you sure about the expression?

Answer 19

oh sorry its 3/r + 5/r-6

Answer 20

\(\frac{3(r-6)}{r(r-6)}+\frac{5r}{r(r-6)}=\frac{8r-18}{r(r-6)}\)

Answer 21

simplify and add or subratct wherever possible:
√3-6√12=4√192