Question

subtract -x²-y²-z² from 1
hint = the final answer is supposed to be "1+x²+y²+z²"​

Answer 1

Answer:

The answer after subtraction is $1+x^2+y^2+z^2$

Step-by-step explanation:

We need to subtract $-x^2-y^2-z^2$ from 1. That is we need to find $1- (-x^2-y^2-z^2)$.

When we multiply two negative values, the answer will be positive. Here we have the same situation.

We can rewrite the above equation as $1+(-1)(-x^2-y^-z^2)$

When we expand the brackets, we are multiplying two negative quantities. So the resultant quantity will be positive.

Thus we get

$1+(-1)(-x^2-y^-z^2)=1+x^2+y^2+z^2$.