Group and factor undistribute then undistribute again remember ab+ac=a(b+c) this is important
6d^4+4d^3-6d^2-4d undistribute 2d 2d(3d^3+2d^2-3d-2) group insides 2d[(3d^3+2d^2)+(-3d-2)] undistribute 2d[(d^2)(3d+2)+(-1)(3d+2)] undistribute the (3d+2) part (2d)(d^2-1)(3d+2) factor that difference of 2 perfect squares (2d)(d-1)(d+1)(3d+2)
77. group (45z^3+20z^2)+(9z+4) factor (5z^2)(9z+4)+(1)(9z+4) undistribuet (9z+4) (5z^2+1)(9z+4)
