3 years ago

Math questions!! 30 points

Mathematics

1 answer:

vampirchik [111]3 years ago

5 0

Answer:

Excluded Value : 3 and -5

Step-by-step explanation:

hello :

Excluded Value : and

the excluded value when : x²+2x-15=0

( x²+2x+1)-1-15=0

means : (x+1)²-16=0 (x+1)²-4² = 0

by identity : a²-b² =(a-b)(a+b)

(x+1-4)(x+1+4) =0 so : (x-3)(x+5) =0 means : x-3=0 or x+5=0

x=3 or x= -5

Excluded Value : 3 and -5

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