Question

Wylicz x:

1 ax - b = cx - d
2 ax^2 + bx = d
3 2(a+2x)+x= b(x+c)
4 (x+a)*b/2 = d

Answer 1

1 ax - b = cx - d
ax-cx=b-d
x(a-c)=b-d
x=(b-d): (a-c)
2 ax^2 + bx -d=0
to równanie kwadratowe

3 2(a+2x)+x= b(x+c)
2ax+4x+x=bx+bc
2ax+5x-bx=bc
x(2a+5-b)=bc
x=bc :(2a+5-b)
4 (x+a)*b/2 = d  /*2
xb+ab=2d
xb=2d-ab
x=(2d-ab):b