(4X+5)(4X-5)=4(2X+3)平方-(100X-17)等于多少

问题描述:

(4X+5)(4X-5)=4(2X+3)平方-(100X-17)等于多少
4(2X+3)平方也就是两个4(2X+3)相乘

(4X+5)(4X-5)=4(2X+3)平方-(100X-17)
16x^2-25=4(4x^2+12x+9)-100x+17
16x^2-25=16x^2+48x+36-100x+17
-25=-52x+53
52x=78
x=3/2