21hali122 21hali122

03-02-2024
Mathematics

contestada

(x-20)²=x²-20
show your working out

Respuesta :

jimrgrant1 jimrgrant1

03-02-2024

Answer:

x = 10.5

Step-by-step explanation:

given the equation

(x - 20)² = x² - 20 ← expand (x - 20)² using FOIL

x² - 40 x + 400 = x² - 20 ( subtract x² from both sides )

- 40x + 400 = - 20 ( subtract 400 from both sides )

- 40x = - 420 ( divide both sides by - 40 )

x = 10.5

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