Posted by Anonymous on Wednesday, March 27, 2013 at 1:03am.
Squaring both sides
3 x + 7 = ( 3 x + 5 ) ^ 2
3 x + 7 = 9 x ^ 2 + 2 * 3 x * 5 + 5 ^ 2
3 x + 7 = 9 x ^ 2 + 30 x + 25
0 = 9 x ^ 2 + 30 x + 25 - 3 x - 7
9 x ^ 2 + 27 x + 18 = 0 Divide both sides by 9
x ^ 2 + 3 x + 2 = 0
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x ^ 2 + 3 x + 2 = 0
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