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3 years ago

X2 - 4x + 4 = 20 please helpppppppp

Mathematics

2 answers:

Sever21 [200]3 years ago

8 0

Answer:

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

egoroff_w [7]3 years ago

6 0

Answer:

6.472

Step-by-step explanation:

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