Question

urgeent,vă rog!Mersi!​

Answer 1

1)

(x+3)²=

x²+2x•3+3²=

x²+6x+9

2)

x=$\sqrt{2}$

y=1

(x-y)(x+y)=

$( \sqrt{2} - 1)( \sqrt{2} + 1) = \\ \\ \sqrt{2} ^{2} - {1}^{2} = \\ \\ 2 - 1 = \\ \\ 1$

3)

2ax-4bx-6x=

$2x( \frac{2ax}{2x} + \frac{ - 4bx}{2x} + \frac{ - 6x}{2x}) =$

2x(a-2b+3)