Question

calcule x, sabendo que BC// CH//:

Answer 1

a)x/x + 5 = 2 x/x + 202 x (x + 5)= x( x + 20)2 x² + 10 x = x² + 20 x2 x² - x² + 10 x - 20 x = 0x² - 10 x = 0x( x - 10 ) = 0x = 0x - 10 = 0x = 10s = 10Resposta O valor de x = 10
b)x/x + 3 = x + 2 / 2 xx(2 x) = (x + 2) ( x + 3)2 x² = x² + 5 x + 6 2 x² - x² - 5 x - 6 = 0x² - 5 x - 6 = 0Δ = b² - 4 a . cΔ= (-5)² - 4 . 1. -6Δ = 25 + 24Δ = 49 ⇒ √ 49 = 7x = - b + ou - 7/2x´= - (-5) + 7/2x = 5 + 7/2x = 12/2x´= 6x" = 5 - 7/2x" = -2/2x" = -1 s = 6Resposta O valor de x = 6