Answer:
What this is is factoring and these are both perfect squares.
(3x-5)(3x+5) is the answer.
Step-by-step explanation:
First we take the 9x^2-25 and split in in two statements
(3x-5) (3x+5)
then foil to check it
first side: 3x*3x=9x^2
outside: 3x*5=15x
inside: -5*3x=-15x
last: -5*5=-25
then put it together
9x^2+15x-15x-25
the 15x and -15x cancel each other out so you're left with 9x^2-25
Answer:
a) 121 combinations
b) 124 combinations
Step-by-step explanation:
a) 5 possible number without repeating any will give us =
5 possible numbers* 4 possible numbers* 3 possible numbers* 2possible numbers + 1 possible numbers = 121 combination
b) 5 possible number but repeating 1 will give us 5 possible numbers* 4 possible numbers * 3 possible numbers* 2possible numbers
+4 possible number
124 combination
Answer:
Step-by-step explanation:
9 = 3^2
16 = 4^2
64 = 8^2
hope this helps
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