Question

(7-х)*(х+2)=0-2.7*х=10.8​

Answer 1

Ответ:3X

Пошаговое объяснение:

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Answer 2

To solve the given equation:

(7 - x) * (x + 2) = 0 - 2.7 * x = 10.8

Let's break it down into two separate equations and solve each one individually.

1. (7 - x) * (x + 2) = 0

Expanding the equation:

7x + 14 - x^2 - 2x = 0

Rearranging the terms:

-x^2 + 5x + 14 = 0

To solve this quadratic equation, we can either factor it or use the quadratic formula. In this case, let's use the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / (2a)

For our equation, a = -1, b = 5, and c = 14. Substituting these values:

x = (-5 ± √(5^2 - 4(-1)(14))) / (2(-1))

Simplifying further:

x = (-5 ± √(25 + 56)) / (-2)

x = (-5 ± √81) / (-2)

x = (-5 ± 9) / (-2)

This gives two possible solutions:

x1 = (-5 + 9) / (-2) = 4 / (-2) = -2

x2 = (-5 - 9) / (-2) = -14 / (-2) = 7

Therefore, the solutions for the equation (7 - x) * (x + 2) = 0 are x = -2 and x = 7.

2. 0 - 2.7 * x = 10.8

Adding 2.7x to both sides:

2.7x = -10.8

Dividing both sides by 2.7:

x = -10.8 / 2.7

Simplifying:

x = -4

Therefore, the solution for the equation 0 - 2.7 * x = 10.8 is x = -4.

In summary, the solutions to the given set of equations are:

1. (7 - x) * (x + 2) = 0: x = -2 and x = 7.
2. 0 - 2.7 * x = 10.8: x = -4.