Verified answer

Answer:

(3) 9+ 4√5

Step-by-step explanation:

If x = 2 + √5, then we can find x² by squaring both sides of the equation:

x = 2 + √5

x² = (2 + √5)²

Expanding the right-hand side of the equation using the formula (a + b)² = a² + 2ab + b², we get:

x² = 2² + 2(2)(√5) + (√5)²

x² = 4 + 4√5 + 5

x² = 9 + 4√5

Therefore, x² is equal to 9 + 4√5.

Answer:

4 none of these

x²=(2+√5)²

(a+b)²