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camille16161616
@camille16161616
January 2021
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URGENT à rendre ce matin je ne comprend rien merci d'avance
a) 3(x+2) + (7+4x)(7-6x)
b) 4(x+9) - (7+x)(x+1)
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maudmarine
Verified answer
Bonjour,
Je suppose qu'il faut développer
?
a) 3(x+2) + (7+4x)(7-6x)
= 3x + 6 + 49 - 42x + 28x - 24x²
= - 24x² + 3x + 28x - 42x + 6 + 49
= - 24x² + - 11x + 55
b) 4(x+9) - (7+x)(x+1)
= 4x + 36 - (7x + 7 + x² + x)
= 4x + 36 - 7x - 7 - x² - x
= - x² + 4x - 7x - x + 36
= - x² - 4x + 36
2 votes
Thanks 1
camille16161616
merci beaucoup!
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Verified answer
Bonjour,Je suppose qu'il faut développer ?
a) 3(x+2) + (7+4x)(7-6x)
= 3x + 6 + 49 - 42x + 28x - 24x²
= - 24x² + 3x + 28x - 42x + 6 + 49
= - 24x² + - 11x + 55
b) 4(x+9) - (7+x)(x+1)
= 4x + 36 - (7x + 7 + x² + x)
= 4x + 36 - 7x - 7 - x² - x
= - x² + 4x - 7x - x + 36
= - x² - 4x + 36