Question

7в+2а-7в² --------- в при а=9 в=12

Answer 1

Если a=9,b=12, то 7b+2a-7b² = 7*12+2*9-7*12²=-906

Answer 2

To calculate the given expression $7в + 2а - 7в^2$ when $а = 9$ and $в = 12$, we substitute the values and perform the operations according to the order of operations (PEMDAS - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction):

$7в + 2а - 7в^2$

Substitute $а = 9$ and $в = 12$:

$= 7(12) + 2(9) - 7(12)^2$

Now, let's calculate step by step:

$= 84 + 18 - 7(144)$ $= 84 + 18 - 1008$ $= 102 - 1008$ $= -906$

So, when $а = 9$ and $в = 12$, $7в + 2а - 7в^2 = -906$.