Question

If A =

( 8 10 -6)
(-8 -10 7)
( 2 -2 -2)
and B =
( 5 1 9)
(-9 -8 10)
(-10 6 -2),
find -7A + 3B

Answer 1

9514 1404 393

Answer:

see below

Explanation:

Carry out the math element by element. For example, ...

c11 = -7a11 +3b11

c11 = -7(8) +3(5) = -41

_____

Additional comment

Matrix operations like this one are easily handled by all spreadsheets and most graphing calculators. Some scientific calculators support matrix operations as well.