Question

Escreva na forma reduzida ax2+ bx + c= 0 e) 20x2+ 7x.(3x-4) = 8x+6 f) 8x2+ 20 – x2= 6.(5-7x2) - 30 h) 5x+(7x-12)-(20+4x) + x2



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Answer 1

e)

20x^2 + 7x * (3x - 4) = 8x + 6

20x^2 + 21x^2 - 28x - 8x - 6 = 0

41x^2 - 36x - 6 = 0

f)

8x^2 + 20 – x^2 = 6 * (5 - 7x^2) - 30

7x^2 + 20 = 30 - 42x^2 - 30

7x^2 + 20 + 42x^2 = 0

49x^2 + 20 = 0

h)

5x + (7x - 12) - (20 + 4x) + x^2 = 0

5x + 7x - 12 - 20 - 4x + x^2 = 0

x^2 + 8x - 32 = 0