2x^2 - 4 = 68
add 4 to both sides
2x^2 = 72
divide both sides by 2
x^2 = 36
find the square root of each sides
x = 6, -6
ANSWER: the positive value of x is 6
Answer:
So any time you are multiplying something, you are making "groups of"
so 3 groups of 2 = 6, 4 groups of 3 = 12
But with decimals or fractions, because they are a value less than zero, the numbers become increasingly small instead of bigger, like standard multiplication.
So for example, 1 group of 1/2 = 1/2
2 groups of 1/4 = 1/2
and so on
hope this helps!
Suppose you can factorize:

Then by expanding the right side, you have

which means in this case, you have to have