You and your friend live 5 mi apart. He says that it is 5 mi from his house to your house and -5 mi from your house to his house
1 answer:
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We'll have to repeatedly square both sides of the equation, in order to get rid of the square roots. Squaring a first time yields
Move the 19 to the right hand side:
And square again:
Square one last time:
Let's check the solutions: all these squaring might have created external solutions:
So, is a feasible solution.