1)
A=3(-2x+5)+(-2x+5)(x-3)
= (3* -2x + 3*5 ) + (-2x * x + -2x * -3 +5*x + 5* -3)
= -6x + 15 + (-2x² +6x +5x -15)
= -6x +15 -2x²+6x +5x -15
=-2x² +5x
B=(2a-5)(3-4a)-2(5-a)
= (2a *3 +2a *-4a -5 * 3 -5* -4a) - 2*5 -2*-a
= 6a - 8a² - 15 +20a - 10 + 2a
= -8a² +28a -25
C=-(3-4z)(z-2)
= - (3*z + 3*-2 -4z * z -4z *-2)
= -( 3z - 6 -4z² +8z)
= -3z +6 +4z² -8z
= 4z² -11z +6
D=-5r(2-3r)+(-r-2)(2r+5)
= -5r *2 -5r* -3r + (-r *2r -r * 5 -2 *2r -2 *5)
= -10r +15r² - 2r² -5r -4r -10
= 13r² -19r -10
2)
A=4x²+4x+4
= 4x² (1 +1/x +1/x²)
B=5x²+10x+15
= 5x (x + 5 + 3/x)
