👤

Sagot :

AYUDA

B = 5x * x + 5x * 7 + x * 7 + x * (-x)

 =     5x²   + 35x    + 7x    - x²

= 4x² + 42x

Salut

[tex]5x(x + 7) + x(7 - x)[/tex]

[tex]5x^2 + 35x + x (7-x)[/tex]

[tex]5x^2 + 35x + 7x - x^2[/tex]

[tex]4x^2 + 42x[/tex]

bonne journée :)

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