Question

(3x+y2)-3x(3x+2y) при y=3.5​

Answer 1

$(3x +3.5 \times 2) - 3x(3x +2 \times 3.5)$

(3х+7)-3х(3х+7)

$= (3x + 7) - (9 {x}^{2} + 21x)$

Answer 2

To evaluate the expression (3x+y^2) - 3x(3x+2y) when y=3.5, we need to substitute the value of y into the expression and then perform the calculations. Let's do that step by step:

Step 1: Substitute y with 3.5 in the expression: (3x + y^2) - 3x(3x + 2y) (3x + 3.5^2) - 3x(3x + 2 * 3.5)

Step 2: Simplify the expression: (3x + 12.25) - 3x(3x + 7) 3x + 12.25 - 9x^2 - 21x

Step 3: Combine like terms: -9x^2 - 18x + 12.25

The simplified expression is -9x^2 - 18x + 12.25. Now, if you have a specific value of x, you can further evaluate this expression by substituting the value of x into it.