4(2x+y) -9(x-2y)

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4(2x+y) -9(x-2y)

4(2x+y) -9(x-2y)
4(2x+y) -9(x-2y)

4(2x+y) -9(x-2y)
4(2x + y)² - 9(x - 2y)²
= [2(2x + y)]² - [3(x - 2y)]²
= [2(2x + y) + [3(x - 2y)][2(2x + y) - 3(x - 2y)]
=(7x - 4y)(x + 8y)

4(2x+y) -9(x-2y)
=8x +4y -9x +18y
=8x-9x+4y+48y= 22y - x

收起 4(2x+y) -9(x-2y)
=8x +4y -9x +18y
= 22y - x