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kevinwoo71
@kevinwoo71
June 2021
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Aidez moi à développer, puis réduire chaque expression.
a) (3x+1)²
b) (7-x)²
c) (9-5x)(9+5x)
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MrEagle
a) = ( 3x + 1 )²
= (3x)² + 2 * 3x * 1 + 1²
= 9x² + 6x + 1
b) = ( 7 - x )²
= 7² - 2 * 7 * x + (x)²
= 49 - 14x + x²
= x² - 14x + 49
c) =
( 9 - 5x ) ( 9 + 5x )
= 9² - (5x)²
= 81 - 25x²
= -25x² + 81
2 votes
Thanks 1
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= (3x)² + 2 * 3x * 1 + 1²
= 9x² + 6x + 1
b) = ( 7 - x )²
= 7² - 2 * 7 * x + (x)²
= 49 - 14x + x²
= x² - 14x + 49
c) = ( 9 - 5x ) ( 9 + 5x )
= 9² - (5x)²
= 81 - 25x²
= -25x² + 81