Question

1) 2 x² + 3a +1=02) 9x² - 6x +1=03 x²+2=0X (х-1= 72)20 баллов!!!!​

Answer 1

Это возможно не правильно

Answer 2

Looks like you've provided three different mathematical expressions. Let's solve each of them:

1. 2x² + 3a + 1 = 0

This is a quadratic equation in terms of x. To solve for x, you need to isolate x:

2x² + 3a + 1 = 0

2x² = -3a - 1

x² = (-3a - 1)/2

x = ±√((-3a - 1)/2)

2. 9x² - 6x + 1 = 0

This is another quadratic equation in terms of x. To solve for x, you can use the quadratic formula:

x = (-b ± √(b² - 4ac)) / (2a)

In this case, a = 9, b = -6, and c = 1. Plug these values into the formula:

x = (-(-6) ± √((-6)² - 4 * 9 * 1)) / (2 * 9)

x = (6 ± √(36 - 36)) / 18

x = (6 ± √0) / 18

Since the discriminant (the value inside the square root) is zero, there is only one real solution:

x = 6/18

Simplify the fraction:

x = 1/3

3. x² + 2 = 0

This is another quadratic equation in terms of x. To solve for x:

x² + 2 = 0

x² = -2

x = ±√(-2)

However, the square root of a negative number is not a real number. Therefore, this equation has no real solutions.

It's not clear what you mean by "X (х-1= 72) 20 баллов!!!!​" Please provide more context or clarification if needed.