9 - 2x(x + 3) + x(2x - 1) = 10; 3x.(x-5):x.(3x-7)= - Dicamon

Question

9 - 2x(x + 3) + x(2x - 1) = 10; 3x.(x-5):x.(3x-7)=16; (x + 1) ^ 3 - (x - 1) ^ 2 - 6x ^ 2 + 2x = 0 d (2x - 1) ^ 3 - 2x * (2/3 + 1) ^ 2 = 5x - 20x ^ 2; (2-x)^ 3 +

Answer

a ) - 2x(x + 3) + x(2x - 1) = 10 ( ) - 2x - 6x + 2x - x = 10; - 7x = 10; x = - 10/7 b ) 9x(x - 5) - x(3x - 7) = 16; 3x ^ 2 - 15x - 3x ^ 2 + 7x = 16; - 8x = 16; x = - 2 ) (x + 1) ^

Answer

No. 1 aligned x-2x(x+3)+x.12x-1)=10  (3x^ 2 +6x+2x^ 2 -x=10 aligned 10 -7x ) 10 7 -5x-7)=16 Vay ( ) 3 16 ) ( ) vậy 1 ) 2 x 0 8x = 16; x = - 2; x ^ 3 + 3x ^ 2 + 3x + 1 - (x ^ 3 - 3x

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