if Sonya's dog weighed 20 kilograms, find the weight of Sonya's cat.

Question

Sonya was comparing the weights of her dog and her cat. The weight of her cat squared plus 4 kilograms is equal to the weight of her dog. Of Sonya's dog weighs 20 kilograms, find the weight of Sonya's cat.

Answer 1

4 kg

Comments

Can you explain how you got this ?

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let c be the cat's weight, and d dog's.
c^2+4=20
c^2=16
c=4