Question

5x的四次方减6x的二次方加四x-+5x的二次方减四x-+9化简

Answer 1

5x^4一6x^2+4x一5x^2一4x一9
=5x^4一(6+5)x^2+(4一4)x一9
=5ⅹ^4一11x^2一9。