`#Sad`
`d)`
`(x+4)^2-(x+1)(x-1) = 16`
`⇔ x^2+8x+16-x^2+1-16 = 0`
`⇔ (x^2-x^2)+8x+(16+1-16) = 0`
`⇔ 8x+1 = 0`
`⇔ 8x = -1`
`⇔ x = -(1)/(8)`
`\text{Vậy}` `x=-(1)/(8)`
`e)`
`(2x-1)^2+(x+3)^2-5(x+7)(x-7) = 0`
`⇔ 4x^2-4x+1+x^2+6x+9-5(x^2-49) = 0`
`⇔ 4x^2-4x+1+x^2+6x+9-5x^2+245 = 0`
`⇔ (4x^2+x^2-5x^2)+(-4x+6x)+(1+9+245) = 0`
`⇔ 2x+255 = 0`
`⇔ 2x = -255`
`⇔ x = -(255)/2`
`\text{Vậy}` `x=-(255)/2`