Question

(12y+30)(1.4-0.7y)=0

Answer 1

Один из множителей должен быть равен нулю обязательно. например 1•0=0 и тд.
следовательно.
12у+30=0
12у=-30
у=-2.5
и
1.4-0.7у=0
-0.7у=-1.4
у=2
ответ: у=-2.5; у=2.

Answer 2

To solve the equation $(12y + 30)(1.4 - 0.7y) = 0$, we need to find the values of $y$ that make the entire expression equal to zero. To do this, we can use the zero-product property, which states that if the product of two factors is zero, then at least one of the factors must be zero.

So, set each factor equal to zero and solve for $y$:

1. $12y + 30 = 0$ Subtract 30 from both sides: $12y = -30$ Divide both sides by 12: $y = -\frac{30}{12} = -\frac{5}{2} = -2.5$

2. $1.4 - 0.7y = 0$ Subtract 1.4 from both sides: $-0.7y = -1.4$ Divide both sides by -0.7 (or multiply by -1 and then divide by 0.7): $y = \frac{-1.4}{-0.7} = 2$

So, the solutions to the equation are $y = -2.5$ and $y = 2$.