Question

What number would you add to both sides of x2 + 7x = 4 to complete the square?

Answer 1

Answer

12.25

Explanation

x² + 7x = 4

The number that should be added on both sides is the square of half the coefficient of x.

That is (7/2)².

(7/2)² = 7²/2²

         = 49/4

          = 12.25

∴ x² + 7x + 3.5² = 4 + 12.25

 (x +  3.5) ² = 16.25

 

Answer 2

Answer:(7/2)2

Step-by-step explanation:the answer is (7/2) to the second power.