Question

a) (x+4)² + (x-2)²-2x²=
b) (2x-3)²-(3x+5)²+(2x+5)(2x-5)=
c) (x+5)²-(x-2)(x+2)+2(x+1)²=
d) (3+4x)²+4(x-2)²-(x+3)(x-3)

Answer 1

a). (x+4)^2+(x-2)^2-2x^2=x^2+8x+16+x^2-4x+4-2x^2=2x^2-2x^2+8x+4x+16+4= 12x+20=4(3x+5). b). (2x-3)^2-(3x+5)^2+(2x+5)(2x-5)= 4x^2-12x+9-9x^2-30x-25+4x^2-25=-x^2-18x-16. c).(x+5)^2+(

Answer 2

a)(x+4)² +(x-2)² -2x²=X²+8x+16+x²-4x+4-2x²=2x²-2x²+8x-4x+16+4=4x+20
b)(2x-3)²-(3x+5)²+(2x+5)(2x-5)=4x²-12x+9-9x²-30x-25+4x²-25= -x²-42x+41
c)(x+5)²-(x-2)(x+2)+2(x+1)²=x²+10x+25-x²+4+2(x²+2x+1)=10x+29+2x²+4x+2=2x²+14x+31
d)(3+4x)²+4(x-2)²-(x+3)(x-3)=9+24x+16x²+4(x²-4x+4)- x²+9=16x²+4x²-x²+24x-16x+16+9=19x²+8x+25