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What number would you add to both sides of x²-20x=5 to complete the square?

What number should be added to both sides of the equation to complete the square? 

x²+8x=4

What number should be added to both sides of the equation to complete the square? 

x²+8x=4

Give the number that must be added to both sides of the equation to complete the square

1. x2 – 6x = 8
2. x2 + 10x = 3
3. m2 + 16m = 4
4. x2 – 30x = 60
5. q2 – 100q = 4