Algebra problem? PLEASE HELP!!!?

Question

i need to find 50, using the digits 1, 9, 9, and 4.

i can only use each number once and have to use every number.

ex: if i need to find something that equals 46, i use (9 x 4) + (9 + 1)

i can do like square root of 9 if you need a 3, or the same with 4 to get two. i can also use any number i dont use as an exponent of 1

Answer 1

(9+1) x (9-4) = 10 x 5=50 Simple ;)

Answer 2

it's so easy ,

the answer is ....

( 9 + 1 ) × ( 9 - 4 ) = 50

Answer 3

9-4=5

9+1=10

5x10=50  

Answer 4

(9-4) * (9+1)