problem: combining like terms exercise 4
Combine the like terms to make a simpler expression:
a) 1/4 y² + 3/8 y – 2/4 y² – 6/8 y =
b) – 0,25x² + 3/5 x + 1/4 x² – 0,2x =
c) – 4,25x² + 4 1/5 x + 2 1/4 x² – 2,4x =
answers: combining like terms exercise 4
a) 1/4 y² + 3/8 y – 2/4 y² – 6/8 y = – 1/4 y² – 3/8 y
in detail:
1/4 y² – 2/4 y² = – 1/4 y²
or + 3/8 y – 6/8 y = – 3/8 y
b) – 0,25x² + 3/5 x + 1/4 x² – 0,2x = + 2/5 x or + 0,4x
in detail:
– 0,25x² + 1/4 x² = – 1/4x² + 1/4 x² = 0
or – 0,25x² + 0,25x² = 0
+ 3/5 x – 0,2x = + 3/5 x – 1/5 x = + 2/5 x
or + 0,6x – 0,2x = 0,4x
c) – 4,25x² + 4 1/5 x + 2 1/4 x² – 2,4x = – 2x² + 1,8x
in detail:
– 4,25x² + 2 1/4 x² = – 4,25x² + 2,25x² = – 2x²
4 1/5 x – 2,4x = 4,2x – 2,4x = + 1,8x