Multiplied 4545

Philip multiplied the number 4 twice in a row by his lucky number. He added 4 to the result and got a result of 200. What is Filip's lucky number?

Correct answer:

x1 =  7
x2 =  -7

Step-by-step explanation:

4 x x+4=200  4 x x+4=200 4x2196=0 4=22 0 196=2272 GCD(4,0,196)=22=4  x249=0 x1,2=±49=±7 x1=7 x2=7 x1=7

Our quadratic equation calculator calculates it.

x2=(7)=7



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