Ques 5 calculate the determinant of A?

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Answer 1 · 2018-03-08T11:18:56

#51#

if

#A=((a,b),(c,d))#

#detA=|(a,b),(c,d)|=ad-bc#

we have

#A=((2,-9),(5,3))#

#detA=|(2,-9),(5,3)|#

#detA=2xx3-(5xx-9)#

#detA=6 - -45#

#detA=6+45=51#

Answer 2 · 2018-03-08T11:28:02

#|A|=51#

#"given a 2 by 2 matrix"#

#A=((a,b),(c,d))#

#"then the determinant of A is "ad-bc#

#A=((2,-9),(5,3))#

#rArrad-bc=(2xx3)-(-9xx5)=51#