Answer:
Step-by-step explanation:
1.) 9x²-×=9
9x^2-x-9=9-9
9x^2-x-9=0
2.) (×+1) (×+5)=9
x^2+6x+5=9
x^2+6x+5-9=9-9
x^2+6x-4=0
3.) 2×(6×+3)=×-5
12x^2+6x=x-5
12x^2+6x+5=x-5+5
12x^2+6x+5=x
12x^2+6x+5-x=x-x
12x^2+5x+5=0
4.) 3×+ (×+6)= 2×
3x+x+6=2x
4x+6=2x
4x+6-6=2x-6
4x=2x-6
4x-2x=2x-6-2x
2x=-6
2x/2=-6/2
x=-3
