Question

3. Solve - 5(x + 4) > 30, x € Z.
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Answer 1

Answer:

2

Step-by-step explanation:

Let the equation equal to 30

So, now we the equation 5(x + 4)=30

on simplifying it we get,

5x+20=30

5x=10

x=2 is the answer

Hope you may get it

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Answer 2

Answer:

1. x < -10

2. x > 2

Step-by-step explanation:

1. If your Question is -5(x + 4) > 30

Then,

-5x - 20 > 30

-5x - 20 - 30 > 0

-5x - 50 > 0

(-5(x + 10)) ÷ (-5) > 0 ÷ (-5)

x + 10 < 0

(Note:- Division by a negative number reverses the equality)

so, x < -10

That is x can be -11, -12, -13, -14,......Upto (-infinity)

2. If your Question is 5(x + 4) > 30

Then,

(5(x + 4)) ÷ 5 > 30 ÷ 5

x + 4 > 6

x > 6 - 4

x > 2

That is x can be 3, 4, 5, 6,...... upto infinity

Hope you understood it........All the best