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(a - b)(1 + a + b)

Step-by-step explanation:

Note that a² - b² is a difference of squares and factors as

a² - b² = (a - b)(a + b), thus

a - b + a² - b²

= a - b + (a - b)(a + b) ← factor out (a - b)

= (a - b)(1 + a + b)

mr. graef told us it is 13 pints

step-by-step explanation:

the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13