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2.factors of 12 are3,4 and 3+4=7
3.3-3.4+4.4=9-12+16=13
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Answer:
1. 1
2. 13
Step-by-step explanation:
1. a² + b² + c² = (a + b + c )²-2ab-2bc-2ca = (a + b + c )²-2(ab+bc+ca)
= 9² - 2(40)
= 81 - 80
= 1
2. a² - ab + b² = a³ + b³ / a + b = (a+b)³-3ab(a+b) / a + b
= 7³ - 3(12)(7) / 7
= 343 - 252 / 7
= 91 / 7
= 13
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