Sunday, September 4, 2016

Can't seem to solve a radical equation? Question is : sqrtx+19+sqrtx2=7



So there is this equation that I've been trying to solve but keep having trouble with.



The unit is about solving Radical equations and the question says
Solve:
x+19+x2=7



I don't want the answer blurted, I want to know how it's done, including steps please.




Thank you!


Answer



x+19+x2=7



Squaring both sides, we have



x+19+2x+19x2+x2=49



Collecting terms, we have




2x+17+2x2+17x38=49



x2+17x38=322x2



Squaring again



x2+17x38=1024128+4x24



x2+17x38=25632x+x2




49x=294



x=29449=6



We can easily verify that this is a correct solution.


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