Question

3)-1,5(x+y)+ x(x+y)-y(x+y)+ (x+y); 4) (t+k) - 8x(t + k); 5) (c+d)x-(c+d)y + 5(c+d) + 5xy(c+d). 3h(3a-8) +9ab(3a-8)-(3a - 8); 91​

Answer 1

3) -1.5(x+y) + x(x+y) - y(x+y) + (x+y) = -1.5(x+y) + x^2 + xy - xy - y^2 + x + y = -1.5(x+y) + x^2 - y^2 + x + y

4) (t+k) - 8x(t+k) = (t+k) - 8xt - 8xk = t + k - 8xt - 8xk

5) (c+d)x - (c+d)y + 5(c+d) + 5xy(c+d) = cx + dx - cy - dy + 5c + 5d + 5cx + 5dx + 5xy + 5xyd = cx + dx - cy - dy + 5c + 5d + 5cx + 5dx + 5xy + 5xyd

6) 3h(3a-8) + 9ab(3a-8) - (3a+8) = 9ha - 24h + 27ab - 72ab - 3a - 8