(a+b)²+25-10a-10b=?
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(a+b)²+25-10a-10b=?(a+b)²+25-10a-10b=?(a+b)²+25-10a-10b=?(a+b)²+25-10a-10b=(a+b)
(a+b)²+25-10a-10b=?
(a+b)²+25-10a-10b=?
(a+b)²+25-10a-10b=?
(a+b)²+25-10a-10b
=(a+b)²-10a-10b+25
=(a+b)²-10(a+b)+25
=(a+b-5)²