find the value of -2 by 3 x -4 by 5 + 1 by 2 and -2 by 3 + -4 by 5 + 1 by 2 compare them what do you observe
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Since both determinants are equal, thus,
2x
2
−24=2−20
2x
2
=2−20+24
2x
2
=6
x
2
=3
x=±
3
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