Hello Uxue,
It is y^2 + 14y + 49 + y^2 = 65 and not y^2 +49 + y^2 = 65 because (y+7)^2 is NOT y^2 + 49.
Instead: (y+7)^2 = (y+7)(y+7) = y^2+7y+7y+49 = y^2 +14y + 49
So when you add (y+7)^2 + y^2, you get y^2 +14y + 49 + y^2.
Cheers!
Uxue C.
asked • 11/20/21for (y + 7)2 + y2 = 65, why is it y^2 + 14y + 49 + y^2 = 65 and not y^2 +49 + y^2 = 65?
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