Question

help please?!?!

Answer 1

Choose the value of the x determinant (Dx) in the following system.
4x + 2y = 5
x – 3y = 7

Answer 2

5(-3) = -15
7(2) = 14

-15-14 = ??

Answer 3

hmmm, I'm assuming is matrices, the Dx as in Cramer's rule

Answer 4

correct

5 2
7 -3

Answer 5

$$
\bf \left[
\begin{matrix}
4& 2& |\color{red}{5}\\
1& -3 &|\color{red}{7}
\end{matrix}
\right] D_x =
\left[
\begin{matrix}
\color{red}{5}&2\\
\color{red}{7}& -3
\end{matrix}
\right]
$$

Answer 6

-29?

Answer 7

correct

Answer 8

how about this one too sorry:
Simplify the expression the root of negative twenty five all over the quantity of five minus two I plus the quantity of one minus four i.

Answer 9

\(\bf \cfrac{\sqrt{-25}}{5-2+1-i} \ \ \ ?\)

Answer 10

you can always use the white board :)

Answer 11

on the bottom it's (5-2i)+(1-4i)

Answer 12

do you rationalize the denominator first?

Answer 13

\(\bf \cfrac{\sqrt{-25}}{(5-2i)+(1-4i)}\) then

Answer 14

yes exactly sorry

Answer 15

well, yes, you'd need to rationalize the denominator

Answer 16

is the answer -5+5i/12

Answer 17

checking

Answer 18

yes