- #1
Remos
- 3
- 0
I had this assignment in math class and it doesn't just add up.
x + square(5x + 10) - 8 = 0
Nothing too difficult to solve.
And the answer is:
x1 = 18 if square(5 * 18 + 10) = -10
x2 = 3 if square(5 * 3 + 10) = 5
But teacher says that x1 is not correct. To me it is not logical.
18 + square(5 * 18 + 10) - 8 = 18 + square(100) - 8 =
= 18 + 10 - 8 = 20 <- it doesn't fit into the equation
&
= 18 - 10 -8 = 0 <- it fits into the equation
I find it logical but teacher says that only positive numbers can come from the square(...).
How so?
10 * 10 = 100
and
-10 * -10 = 100
so
square from 100 is
10
and
-10.
Where's the catch?
Am I missing something?
x + square(5x + 10) - 8 = 0
Nothing too difficult to solve.
And the answer is:
x1 = 18 if square(5 * 18 + 10) = -10
x2 = 3 if square(5 * 3 + 10) = 5
But teacher says that x1 is not correct. To me it is not logical.
18 + square(5 * 18 + 10) - 8 = 18 + square(100) - 8 =
= 18 + 10 - 8 = 20 <- it doesn't fit into the equation
&
= 18 - 10 -8 = 0 <- it fits into the equation
I find it logical but teacher says that only positive numbers can come from the square(...).
How so?
10 * 10 = 100
and
-10 * -10 = 100
so
square from 100 is
10
and
-10.
Where's the catch?
Am I missing something?