Question

2a + 4 = 0, a = 2, -2, 1 equation in one variable in detail

Answer 1

you just have to put the given values and then simplify eg.2a+0
2(2)+4=0
4+5=0is wrong

2(-2)+4=0
-4+4=0
0=0is right

2(1)+4=0
2+4=0
6=0is wrong

hope it helps
plz mark brainliest

*OR*

2a+4=0
2a=-4
a=-2
hope it helps
plz mark brainliest

Answer 2

Answer: The value of a in the given equation is -2

Step-by-step explanation:

The given equation is,

2a + 4 = 0

We need to find the value of a which holds the equation good.

Given values of a are

i) 2

ii) -2

iiii) 1

Let us consider the first case, i.e, a = 2

Putting in 2a + 4 = 0

therefore, 2(2) + 4 = 0

i.e, 4 + 4 = 0

i.e, 8 = 0, which is false, hence a= 2 is not the correct value of a in the given equation.

Now, let us consider the second case, i.e, a =-2

Putting in 2a + 4 = 0

therefore, 2(-2) + 4 = 0

i.e, - 4 + 4 = 0

i.e, 0 = 0, which is true, hence a= -2 is the correct value of a in the given equation.

Since it is equation in 1 variable, a can have only one value.

So third case will also be false.

Rechecking the third case i.e, a = 1

Putting in 2a + 4 = 0

therefore, 2(1) + 4 = 0

i.e, 2 + 4 = 0

i.e, 6 = 0, which is false, hence a= 1 is not the correct value of a in the given equation.

Hence the value of a in the given equation is -2.