Question

(-2х - 5) (0,3х + 2.7) = 0.​

Answer 1

-0,6х-5,4х-1,5х-13,5=0

-7,5х=13,5

х=13,5:7,5

х=1,8.

Answer 2

To find the value of x that makes the expression (-2x - 5)(0.3x + 2.7) equal to 0, we can set the entire expression equal to 0 and then solve for x.

So, the equation becomes:

(-2x - 5)(0.3x + 2.7) = 0

Now, there are two factors being multiplied together to result in zero. According to the zero product property, for the product to be zero, at least one of the factors must be zero.

So, we have two cases:

1. -2x - 5 = 0
2. 0.3x + 2.7 = 0

Let's solve each equation separately:

1. -2x - 5 = 0 Add 5 to both sides: -2x = 5 Now, divide by -2: x = 5 / -2 x = -2.5

2. 0.3x + 2.7 = 0 Subtract 2.7 from both sides: 0.3x = -2.7 Now, divide by 0.3: x = -2.7 / 0.3 x = -9

So, the two solutions for x that make the expression equal to zero are x = -2.5 and x = -9.