Mathomatic - Web-Client

1—> 25a-(12a-(8b-(11a+19b-13c)-5c)+2a)+28b

#1: (25·a) − (12·a) + (8·b) − (11·a) − (19·b) + (13·c) − (5·c) − (2·a) + (28·b)

1—> simplify

#1: (17·b) + (8·c)

1—> clear
1—> ; do something new
1—> 0=2x^2-3x-20

#1: 0 = (2·(x^2)) − (3·x) − 20

1—> solve x
Equation is a degree 2 polynomial in (x).
Equation was quadratic.

        3   13·sign
#1: x = — − ———————
        4      4

1—> calculate
There are 2 solutions.

Solution number 1 with sign = 1:
 x = -2.5 = -5/2

Solution number 2 with sign = -1:
 x = 4

1—>