help i dont know what im doing

Factoring GCF Binomials

100

15x+40

5(3x+8)

200

3x²-7x

x(3x-7)

300

24x2+8x

4x(6x+2)

400

81ab²-9a²b

9ab(9b-a)

500

9x²y²+3xy²

3xy²(3x+1)

Factoring DOPs Binomials

100

x²+121

(x+11)(x-11)

200

9x²-81

(3x+9)(3x-9)

300

a²-49b²

(a+7b)(a-7b)

400

16x²-144b²

(4x-12b)(4x+12b)

Factoring a Simple Trinomials

100

x²+9x+25

(x+4)(x+5)

200

x²+10x+21

(x+7)(x+3)

300

x²+11x+30

(x+5)(x+6)

400

x²-1x-12

(x-4)(x+3)

Factoring a Complex Trinomial

100

3x²+7x=4

(3x+4)(x+1)

200

3x²+19x+20

(3x+4)(x+5)

300

5x^2+16x+11

(5x+11)(x+11)

400

2x²+12x=-16

(x+2)(x+4)

Solving Quadratics

100

x²=256

x=16,-16

200

3x²=81

x=3i,-3i

300

 9x²-24x=-24

x=24+12i sqrt(2)/ 18

x=24-12i sqrt(2)/ 18

400

8n²-2+18n=6-n

x= -19+5 sqrt(17)/ 16

x= -19-5 sqrt(17)/ 16