Mary has nickels and dimes in her purse. She has a total of 30 coins worth $2.40. How many nickels does Mary have?
1 answer:
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For this case we have the following equation:
Rewriting we have:
We raise both members of the equation to the square:
Rewriting we have:
It's a extraneous solution because equality is not met by substituting x = 10 in the original equation:
Answer:
The solution is:
It's a extraneous solution
Rewriting we have:
We raise both members of the equation to the square:
Rewriting we have:
It's a extraneous solution because equality is not met by substituting x = 10 in the original equation:
Answer:
The solution is:
It's a extraneous solution