Question

Решите (1,8-0,3y)*(2y+9)

Answer 1

...=3.6y+16.2-0.6y²-2.7y=-0.6y²+0.9y+16.2

Answer 2

To solve the expression (1.8 - 0.3y) * (2y + 9), we can use the distributive property to multiply the terms together. Here are the steps:

Step 1: Distribute (multiply) the first term (1.8 - 0.3y) with each term in the second parentheses (2y + 9).

(1.8 - 0.3y) * (2y + 9) = 1.8 * 2y + 1.8 * 9 - 0.3y * 2y - 0.3y * 9

Step 2: Simplify each term.

1.8 * 2y = 3.6y 1.8 * 9 = 16.2 -0.3y * 2y = -0.6y^2 (when multiplying y terms, add the exponents) -0.3y * 9 = -2.7y

Step 3: Combine the simplified terms.

Now, the expression becomes:

3.6y + 16.2 - 0.6y^2 - 2.7y

Step 4: Combine like terms, which means adding or subtracting the coefficients of the same degree of y.

(3.6y - 2.7y) + 16.2 - 0.6y^2 = 0.9y + 16.2 - 0.6y^2

So, the simplified expression is:

0.9y + 16.2 - 0.6y^2