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Zbrk
@Zbrk
May 2019
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Bonjour, vous pouvez m’aider à résoudre les deux équations suivantes svp:
a) -(3x-5) au carré -(5x+1)+7= (7x-2)(3+4x)-37x au carré +15
b) 8-(7x+9) au carré +4x= 7x (3-7x)-3/4 x
Merci d’avance à ceux qui m’aideront!
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Verified answer
A) -(3x-5)²-(5x+1)+7=(7x-2)(4x+3)-37x²+15
-(9x²-30x+25)-5x+6=28x²+13x-6-37x²+15
-9x²+25x-19=-9x²+13x+9
25x-13x-19-9=0
12x-28=0
x=28/12
x=7/3
b) 8-(7x+9)²+4x=7x(-7x+3)-3x/4
8-(49x²+126x+81)+4x=-49x²+21x-3x/4
-49x²-122x-73=-49x²+81x/4
-569x/4=73
-569x=292
x=-292/569
2 votes
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Verified answer
A) -(3x-5)²-(5x+1)+7=(7x-2)(4x+3)-37x²+15-(9x²-30x+25)-5x+6=28x²+13x-6-37x²+15
-9x²+25x-19=-9x²+13x+9
25x-13x-19-9=0
12x-28=0
x=28/12
x=7/3
b) 8-(7x+9)²+4x=7x(-7x+3)-3x/4
8-(49x²+126x+81)+4x=-49x²+21x-3x/4
-49x²-122x-73=-49x²+81x/4
-569x/4=73
-569x=292
x=-292/569