Question

Bài này mình cần gấp 

Answer 1

a) 2(x-1)²-4(3+x)²+2x(x-5)=2(x²-2x+1)-4(9+6x+x²)+2x²-10x=2x²-4x+2-36-24x-4x²+2x²-10x=-38x-34=-2(19x+17)

Answer 2

b)2(2x+5)²-3(4x+1)(1-4x)=2(4x²+20x+25)-3(1-16x)=8x²+40x+50+3-48x=8x²-8x+53

Answer 3

c)(7x+4)²-(7x+4)(7x-4)=(7x+4)(7x+4-7x+4)=(7x+4)8=56x+32

Answer 4

d)4(x+1)²+(2x-1)²-8(x-1)(x+1)=4(x²+2x+1)+(4x²-4x+1)-8(x²-1)=4x²+8x+4+4x²-4x+1-8x²+8=4x+13

Answer 5

e)(2x+3)²+(2x-3)²-2(4x²-9)=4x²+12x+9+4x²-12x+9-8x²+18=36

Answer 6

f)(x-2)²+(x+3)²-2(x+1)(x-1)=x²-4x+4+x²+6x+9-2(x²-1)=x²-4x+4+x²+6x+9-2x²+2=2x+15