Question

4а2 – 12ав + 9в2 при а = 4,5 и в = 5

Answer 1

4а^2 – 12аb + 9b^2= (2a-3b)^2 

Если а = 4,5 и b = 5 , то

(2*4,5- 3*5)^2= (9-15)^2= (-6)^2= 36

 

Answer 2

4а2 – 12ав + 9в2 при а = 4,5 и в = 5

4а2 – 12ав + 9в2= (2а-3в)^2

(2а-3в)^2= (2*4,5-3*5)^2= (9-15)^2= (-6)^2= 36

Примечание: ^2-это значит в квадрате.

Ответ: 36

 

Answer 3

To evaluate the expression 4а2 – 12ав + 9в2 when a = 4.5 and b = 5, we simply substitute these values into the expression and simplify:

4а2 – 12ав + 9в2 = 4(4.5)2 – 12(4.5)(5) + 9(5)2 = 4(20.25) – 270 + 225 = 81 – 270 + 225 = 36

Therefore, when a = 4.5 and b = 5, 4а2 – 12ав + 9в2 equals 36.