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karina1713
@karina1713
September 2021
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Lesben
1) 14ax²-7a=7a(2x²-1)
a²-9y²=(a+3y)(a-3y)
x(3a+c)-y(3a+c)=(3a+c)(x-y)
4a+xy+ay+4x=a(4+y)+x(y+4)=(y+4)(a+x)
2)3a(a+1)+(a+2)(a-3)=3a²+3a+a²+2a-3a-6=4a²+2a-6
(3x+1)²-3(3x+7)=9x²+6x+1-9x-21=9x²-3x-20
3)(7-x)(7+x)+(x+3)²=49-x²+x²+6x+9=6x+58
x=-3,5 , 6.(-3,5)+58=-21+58=37
((a+b)²=a²+2ab+b²)
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Answers & Comments
a²-9y²=(a+3y)(a-3y)
x(3a+c)-y(3a+c)=(3a+c)(x-y)
4a+xy+ay+4x=a(4+y)+x(y+4)=(y+4)(a+x)
2)3a(a+1)+(a+2)(a-3)=3a²+3a+a²+2a-3a-6=4a²+2a-6
(3x+1)²-3(3x+7)=9x²+6x+1-9x-21=9x²-3x-20
3)(7-x)(7+x)+(x+3)²=49-x²+x²+6x+9=6x+58
x=-3,5 , 6.(-3,5)+58=-21+58=37
((a+b)²=a²+2ab+b²)