Question

3(2x+1(-x+3)-(2x+5)²=-[-{-3(x+5)}+10x²]​

Answer 1

Respuesta:

3 ( 2x + 1) (- x + 3) - ( 2 x + 5) ² = - [ - { -3 ( x + 5 } + 10 x ²]

(6x+3)(-x+3) --(4x²+20x +25)=-[-{-3x-15} +10x²]

6x²+18x-3x+9 -4x²-20x-25 = -10x²-3x -15

2x²-5x -16 = -10x² -3x -15

10x²+3x +15 +2x² -5x -16 =0

12x²-2x -1=0

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