Question

(2-5b)×(2+5b)-(3-5b)квадрат=18​

Answer 1

Ответ:

Пошаговое объяснение:

(2-5b)×(2+5b)-(3-5b)²=18​

4-25b²-(9-30b+25b²)=18

4-25b²- 9+30b-25b²-18=0

-50b²+30b-23=0

D = b² - 4ac = 30² - 4·(-50)·(-23) = 900 - 4600 = -3700

Так как дискриминант меньше нуля, то уравнение не имеет действительных решений.

Answer 2

Let's solve the equation step by step:

(2 - 5b) × (2 + 5b) - (3 - 5b)² = 18

First, we'll expand the squared term:

(2 - 5b) × (2 + 5b) - (3 - 5b) × (3 - 5b) = 18

Next, we'll apply the distributive property to expand the parentheses:

(2 × 2 + 2 × 5b - 5b × 2 - 5b × 5b) - (3 × 3 - 3 × 5b - 5b × 3 + 5b × 5b) = 18

Simplify further:

(4 + 10b - 10b - 25b²) - (9 - 15b - 15b + 25b²) = 18

Combine like terms:

4 - 9 + 10b - 10b + 15b - 15b - 25b² + 25b² = 18

The middle terms with 'b' cancel out:

-5 = 18

This is not a valid equation as it leads to a contradiction. Therefore, there might be an error in the initial expression or the equation itself. Please double-check the equation, and if you need further assistance, feel free to ask.