X2 - 4x + 4 = 20 please hel

6.472

Step-by-step explanation:

x = 2 ± 2√5     Exact solution

x = {-2.472, 6.472}    Decimal approximation

Step-by-step explanation:

x² - 4x + 4 = 20

Subtract 4 from both sides

x² - 4x = 16

Complete the square using half the x coefficient, (-4/2 = -2),  as the complete the square term

(x - 2)² = (-2)² + 16

(x - 2)² = 20

Take the square root of both sides

x - 2 = ±√20

x - 2 = ±2√5

Add 2 to both sides

x = 2 ± 2√5     Exact solution

x = {-2.472, 6.472}    Decimal approximation

Note this could also be solved using the quadratic formula

126 maybe. sorry