Question

Fill in the number that completes the square. x² + 4x + ___

Answer 1

Given :-

• x² + 4x + __

To find :-

• The value of blank .

Solution :-

We can use the identity ,

• (a+b)² = a² + b² + 2ab .

Given ,

• x² + 4x + __
• x² + 2*2*x + __

Add 2²

• x² + 2.2.x + 2²
• ( x + 2)²