Question

2X(X) +3X -4 =16

Answer 1

更新1:

要埋步骤 唔该~~

您好，我是 lop，高兴能解答您的问题。 2X²+ 3X - 4 = 16 2X²+ 3X - 4 - 16 = 16 - 16 2X²+ 3X - 20 = 0 ( 2X²+ 8X ) - ( 5X + 20 ) = 0 4X(X+4) - 5(X+4) = 0 (4X-5)(X+4) = 0 4X-5=0 or X+4=0 X = 5/4 or X = -4 X = -4 or 5/4 2011-09-20 17:54:45 补充： 抄错了 sorry
correction 001 : 2X²+ 3X - 4 = 16 2X²+ 3X - 4 - 16 = 16 - 16 2X²+ 3X - 20 = 0 ( 2X²+ 8X ) - ( 5X + 20 ) = 0 2X(X+4) - 5(X+4) = 0 (2X-5)(X+4) = 0 2X-5=0 or X+4=0 X = 5/2 or X = -4 X = -4 or 5/2
参考: Hope I Can Help You ^_^ ( From me )
2X(X) +3X -4 =16 2x^(2)+3x-4=16 2x^(2)+3x-20=0 (2x-5)(x+4)=0 2x-5=0 or x+4 =0 x=5/2 or x=-4
2x+3(-4)=16 2x-12=16 2x=28 X=14 2011-09-14 19:14:17 补充： 你个x吾是乘？。那2x^2+3x-4=16 2x^2+3x-20=0 (2x-5)(x+4)=0 X=5/2. X=-4 2011-09-14 19:21:25 补充： lop....你把2X^2+8X 变4X(X+4).... 4X(X+4)=4X^2+8X 2X^2=/= (2X)^2 ....
2X(X)+3X-4=16 2X^2+3X-4=16 2X^2+3X-20=0 (2X-5)(X+4)=0 X=2.5 or X=-4
参考: 我