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3 ( x+ 5 )²  = 48

3 ( x² + 10 x +25 ) = 48

3 x² + 30 x + 75 - 48 = 0

3 x² + 30 x + 27 = 0

Δ = 30 ² - 4 ( 3 * 27)  = 900 - 324 =  576  = 24 ²

x 1 = (  - 30 - 24 ) / 6 =  - 54 /6 =  - 9

x 2 = ( - 30 + 24 ) / 6 =  - 6 /6 = -  1

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