gáp chieuf thi rút gọn D=(x-5)(x+5)-(x-8)(x+4) 27/11/2021 Bởi Rylee gáp chieuf thi rút gọn D=(x-5)(x+5)-(x-8)(x+4)
`\text{~~Holi~~}` `D=(x-5)(x+5)-(x-8)(x+4)` `= x^2-25-(x^2+4x-8x-32)` `= x^2-25-(x^2-4x-32)` `= x^2-25-x^2+4x+32` `= 7+4x` Bình luận
`D=(x-5)(x+5)-(x-8)(x+4) = x^2-25-(x^2-4x-32) = 4x+7`
`\text{~~Holi~~}`
`D=(x-5)(x+5)-(x-8)(x+4)`
`= x^2-25-(x^2+4x-8x-32)`
`= x^2-25-(x^2-4x-32)`
`= x^2-25-x^2+4x+32`
`= 7+4x`