Question

4 (2× -3) = 5(× +3)
Help

Answer 1

Resposta:

4 × ( 2x - 3 ) = 5 × ( x + 3 )

8x^2 - 12x = 5x^2 + 15

8x^2 - 5x^2 - 12x = 15

3x^2 - 12x = 15

3x^2 - 12x - 15 = 0

Delta, caso a questão peça:

delta = b^2 - 4ac

Delta = (-12)^2 - 4 × 3 × (-15)

Delta = 144 + 180 -> 324 raiz de delta : 18

× = -b +/- raiz de delta / 2×a

× = 39