Question

Resolva: 7x²/4 - 9x/10 = 2x²/5

Answer 1

7x^2/4 - 9x/10 = 2x^2/5

m.m.c. entre 4, 10 e 5 = 20

35x^2 - 18x = 8x^2
   20       20      20

35x^2 - 8x^2 + 18x = 0

27x^2 + 18x = 0
9x(3x + 2) = 0
9x = 0
x'= 0

3x + 2 = 0
3x = -2
x = -2/3

Solução: { 0, -2/3}