Multiply x and 0.75
Multiply x and 1
The x just gets copied along.
The answer is x
x
0.75*x evaluates to 0.75x
Because of the minus sign
0.75x becomes - 0.75x
The answer is -0.75x
-0.75*x+6 evaluates to -0.75x+6
Multiply x and 2.5
Multiply x and 1
The x just gets copied along.
The answer is x
x
2.5*x evaluates to 2.5x
2.5*x-1.9 evaluates to 2.5x-1.9
To subtract the polynomials -0.75x+6 and 2.5x-1.9 we try to subtract terms in one polynomialwith any like terms in the other polynomial.
Be very careful with the "-" sign in front of 2.5x-1.9 it is to be used on all terms in it.
-0.75x - 2.5x = -3.25x
6 - -1.9 = 7.9
The answer is -3.25x+7.9
(-0.75*x+6)-(2.5*x-1.9) evaluates to -3.25x+7.9