a) 2x(12x–5) – 8x(3x-1) = 30 b)

=> 2x.12x – 2x.5 2x – 8x.3x + 8x.1 = 30

=> 24x² – 10x – 24x² + 8x = 30

=> -10x + 8x = 30

=> -2x = 30

=> -x = 15

=> x = -15

4 : 3=tứ chia tam=tám chia tư= 8 : 4 =2

tick mk nha

X(x-y) + y(x-y)

= x.x – x.(-y) + y.x + y.(-y)

= x² – xy + yx – y²

= x² – y²

x(x-y)+y(x-y)

= x.x+x.(-y)+y.x+y.(-y)

=x^2-xy+yx-y^2

=x^2-y^2