Question

-m(m+2)+(m+3)(m-3) при m=1/2

Answer 1

-m^2-2m+m^2-9

-2m-9

-1-9= -10

Answer 2

To evaluate the expression -m(m+2) + (m+3)(m-3) when m=1/2, you simply substitute the value of m into the expression and perform the calculations.

Let's do it step by step:

1. Replace m with 1/2 in the expression:

   • (1/2)(1/2 + 2) + (1/2 + 3)(1/2 - 3)

2. Simplify the terms inside parentheses:

   • (1/2)(5/2) + (7/2)(-5/2)

3. Multiply the terms inside the parentheses:

   • (5/4) - (35/4)

4. Combine the fractions with a common denominator:

   • (5/4) - (35/4) = (-30/4)

5. Simplify the result: -30/4 = -15/2

So, when m=1/2, the value of the expression -m(m+2) + (m+3)(m-3) is -15/2.