Bab 15 Matriks

4.9 SPM Practis (Kertas 1)
Soalan 5:
Diberi bahawa (3  x)(x1)=(18),  cari nilai x.

Penyelesaian:
(3  x)(x1)=(18)
[3 × x + x (–1)] = (18)
3xx = 18
2x = 18
x = 9


Soalan 6:
(3423)(52)= 


Penyelesaian:
(3423)(52)=((3)(5)+(4)(2)(2)(5)+(3)(2))                      =(158106)                      =(716)



Soalan 7:
(243401)(13)=

Penyelesaian:
Peringkat hasil darab dua matriks
=(3×2)(2×1)=(3×1)

(243401)(13)=(2(1)+4(3)(3)(1)+0(3)(4)(1)+1(3))                     =(2123+043)                     =(1031)



Soalan 8:
(1  1   2)(513204)=

Penyelesaian:
Peringkat hasil darab dua matriks
=(1×3)(3×2)=(1×2)

(1  1   2)(513204)=
= (1×5 + (–1)(–3) + (2)(2)  1×1 + (–1)(0) + (2)(4))
= (5 + 3 + 4   1 + 0 + 8)
= (12   9)