Question

Срочно!!!
Решите пожалуйста №4

Answer 1

Лучше см. рисунок

3(5x+3)(4x2-1)=8(4x2-1)2

3(5x+3)(4x2-1)-8(4x2-1)2=0

(4x2-1) (3(5x+3)- 8(4x2-1)) =0

(4x2-1) =0                                           или (3(5x+3)- 8(4x2-1)) =0

(4x-1) (4x+1)=0                                               15x+9-32x2+8=0

4x-1=0  или  4x+1=0                                     -32x2+15x+17=0

х=1/4                    x=-1/4                  D= b2-4ac=225 +2176=2401 >0   =49

                                                                

                                                              

 

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