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Sagot :

LROUMANE

Explications étape par étape

1. A = ( 4 + x )( 2 + x )

2. A = ( 4 + x )( 2 + x )

= 8 + 4x + 2x + x^2

= x^2 + 6x + 8

3. x = 5

A = ( 4 + 5 )( 2 + 5 )

A = 9 * 7 = 63 cm^2

ou

A = 5^2 + 6 * 5 + 8

A = 25 + 30 + 8

A = 63 cm^2

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