find the value of following determinants
5 3
-7 -4
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Step-by-step explanation:
∣A∣=∣∣∣∣∣∣(a11a21a12a22)∣∣∣∣∣∣=a11a22−a21a12
∣∣∣∣∣∣5−7−34−∣∣∣∣∣∣=(5∗−4)−(−7∗−3)=−20−14=−34
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