1. (a+3)-2 (a+3) = a+3 -2a -6 = -a - 3
2. ax-ay+5x-5y= (ax+5x)+(-ay-5y)= (x-y)(a+5)
3. 1,5x (3x^2-5)(2x^2+3)=9x^5-1,5x^3-22,5x
4. 2a-ac-2c+c^2=(2a-ac)-(2c-c^2)=(a-c)(2-c)
5. 5a-5b-xa+xb-b+a= (5a-xa+a)-(5b+xb-b)=(a-b)(6-x)
6. (x+3)(x-2)+5=x^2
x^2-2x+3x-6+5=x^2
x=1
7. 4x^2+9x=0
x (4x+9)=0
x=0 и x=-9/4
1. (a+3)-2 (a+3) = a+3 -2a -6 = -a - 3
2. ax-ay+5x-5y= (ax+5x)+(-ay-5y)= (x-y)(a+5)
3. 1,5x (3x^2-5)(2x^2+3)=9x^5-1,5x^3-22,5x
4. 2a-ac-2c+c^2=(2a-ac)-(2c-c^2)=(a-c)(2-c)
5. 5a-5b-xa+xb-b+a= (5a-xa+a)-(5b+xb-b)=(a-b)(6-x)
6. (x+3)(x-2)+5=x^2
x^2-2x+3x-6+5=x^2
x=1
7. 4x^2+9x=0
x (4x+9)=0
x=0 и x=-9/4