Question

HELLLP with matrices!!!!

Answer 1

go for it

Answer 2

and help with this one PLEASE![:

Answer 3

Okay, notice you have a 2x3 matrix times a 3x2 matrix, this tells you that you should get out a 2x2 matrix. Take each ROW in the first one and multiply the terms by the first COLUMN in the second one, then sum them up.
Giving:
\[\left[\begin{matrix}(4)(-4)+(-7)(6)+0(1) & 4(2)+(-7)(0)+0(-9)\\(-4)(3)+5(6)+(-1)(1)&3(2)+5(0)+(-1)(-9)\end{matrix}\right]=\left[\begin{matrix}-58&8\\17&15\end{matrix}\right]\]

Answer 4

That should read: "take each ROW in the first one and multiply the terms by each COLUMN in the second one"

Answer 5

For the second one you have a 1x2 matrix times a 2x1, so you should get a 1x1 (scalar) matrix. So take the row and multiply by the column.
\[\left[\begin{matrix}7(2)+8(9)\end{matrix}\right]=[86]\]

Answer 6

Make sense?

Answer 7

Hmm, yes, the second one you explain makes the most sense, though. THANKYOU!!!

Answer 8

no problemmm