2x+6y-x²+9y²=?
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2x+6y-x²+9y²=?2x+6y-x²+9y²=?2x+6y-x²+9y²=?x2-9y2+2x-6y=(x-3y)(x+3y)+2(
2x+6y-x²+9y²=?
2x+6y-x²+9y²=?
2x+6y-x²+9y²=?
x2-9y2+2x-6y
=(x-3y)(x+3y)+2(x-3y)
=(x-3y)(x+3y+2
=(2x+6y)-(x²-9y²)
=2(x+3y) -(x-3y)(x+3y)
=(x+3y)(2-x+3y)
=2x + 6y - (xx - 9yy)
=2(x + 3y) - (x - 3y)(x+3y)
=(x + 3y)(2 - x + 3y)
2x+6y-x^2+9y^2
=2(x+3y)+(3y+x)(3y-x)
=(3y+x)(3y-x+2)