Question

the square of a number is 21 more than 4 times the number find the number ​

Answer 1

Answer:1,94,481

Step-by-step explanation: more than 21 4 times means 21×21×21×21 = 1,94,481

Answer 2

Answer:

Let the number be x

x² = 4x + 21

x² - 4x - 21 = 0

so , when we factorise them

  ( x-7 ) ( x+3 ) = 0

therefore ,

 x = 7 , -3

Step-by-step explanation:

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