Question

simplify a + b 2 b + 3 c square minus a minus b minus 3 c square minus b square -9 BC

Answer 1

Hey
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Let me tell you the formula for ↓

★(a+b+c)2

= (a+b)2 + c2 + 2c(a+b) (a+b+c)2 =a2+b2+2ab+c2+2ac+2bc =a2+b2+c2+2ab+2ac+2bc

★(a - b - c)²

= (a - b - c)(a - b - c)
= a(a - b - c) - b(a - b - c) - c(a - b - c)
= a² - ab - ac - ab + b² + bc - ac + bc +
c²
= a² + b² + c² - 2ab - 2ac + 2bc

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Now..you can see the attachment
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Answer 2

Answer:

the answer of the question is here