SOLUTION: 7x(5-x)=14

Algebra ->  Test -> SOLUTION: 7x(5-x)=14      Log On


   



Question 578327: 7x(5-x)=14
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
7x%285-x%29=14divide by 7
x%285-x%29=2 open the brackets
5x-x%5E2=2
-x%5E2%2B5x-2=0 multiply by -1
x%5E2-5x%2B2=0
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%28-5%29+%2B-+sqrt%28+%28-5%29%5E2-4%2A1%2A2%29%29%2F%282%2A1%29+
x%5B1%5D=%285+%2B+sqrt%28+17%29%29%2F2+
x%5B2%5D=%285+-+sqrt%28+17%29%29%2F2+