Question

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Answer 1

Explicação passo-a-passo:

6) 12x² -8x -4 = 5x² -4

12x² - 5x² - 8x -4 +4=0

7x² - 8x= 0

a= 7

b= - 8

c=0

7) (2x-5) . ( 2x -5) = 7x -6 .(x+3) - 4

4x² -10x - 10x + 25 = 7x - 6x - 18 -4

4x² - 20x +25 = x - 22

4x² -20x - x +25 +22=0

4x² - 21x + 47=0