You can put this solution on YOUR website! The question can be factorised in the following manner :-
(c + 3)^2 - 49
(c + 3)^2 - 7^2
Now using the formula that a^2 - b^2 = (a + b) (a - b)
(c + 3 + 7) (c + 3 - 7)
So we get (c + 3 + 7) = 0
c + 10 = 0
c = -10
(c + 3 - 7) = 0
c - 4 = 0
c = 4
Hope this is clear to you.
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You can put this solution on YOUR website! This is NOT an equation, so you can't solve for c, as was done in the previous solution that was posted by a tutor. The problem is to FACTOR the expression, NOT to SOLVE the equation!!
It should be
( (c+3) - 7 )( (c+3) + 7)