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Peta attempted to solve the following equation. Explain Peta's error.
x (x - 5) = 20
x = 20 and x - 5 = 20
x = 20 and x = 25

Respuesta :

shaungambrell

Answer:

peta didn't subtract the answer right and the second  x right it should be 15

Step-by-step explanation:

Answer:

see explanation

Step-by-step explanation:

The error is in equating x(x - 5) = 20

and assuming x = 20 , x - 5 = 20

The correct approach is to rearrange the equation into standard form by subtracting 20 from both sides and equating to zero, that is

x(x - 5) - 20 = 0

x² - 5x - 20 = 0 ← in standard form

Then solve using the quadratic formula or completing the square