Author Topic: How to solve this Matrices...  (Read 1683 times)

Offline rickyponting66

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How to solve this Matrices...
« on: September 23, 2009, 12:09:37 pm »
Hi!

Plz explain how to multiply these matrices (see the picture)...
Plz Help!
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Offline astarmathsandphysics

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Re: How to solve this Matrices...
« Reply #1 on: September 23, 2009, 12:46:55 pm »
We have a 1 by 3 matrix multi[lied by a 3 by 5 matrix so the answer will be a 1 by 5 matrix  1 row 5 columns


Multiplying matrices is always row by colums

column 1: 14*1.2+16*0+18*1.4=16.8+25.2=42
column two:14*0+16*1.6+18*1.8=25.6+32.4=58
column 3:14*1.4+16*1.6+18*0=19.6+25.6+0=45.2
column 4:14*2.6+16*2.8+18*3=36.4+44.8+54=135.2
column5: 14*5.2+16*4.7+18*4.4=16.8+25.2=72.8+75.2+79.2=227.2

(42,58,45.2,135.2,227.2)