Posted by **Marian** on Tuesday, March 1, 2011 at 6:51am.

x^2-7x = 0

substitue x=7 into the equatiopn and explain why this shows that x=7 is the solution.

ok so i do this: if x=7 then the equation becomes

7^2-49=0

7^2=49

49-49=0

so x=7 is correct (is that explanation enough?)

now i have to write out a complete solution to the orginal equation - i thought i had already done that above, could someone help me out please!

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