What do you use to remove any grouping symbols in math

Problem 2.   Remove the parentheses.

a)   p + (q −r + s) = p + q − r + s

b)   p − (q −r + s) = p − q + r − s

In each of the following problems, remove the parentheses, then simplify
by adding the numbers.

For example,

The sign preceding  (x − 3)  is understood to be + . Therefore the signs within those parentheses do not change.

But the sign preceding (y − 4) is minus.  Therefore, y changes to −y, and −4 changes to +4.

Finally, it is the style in algebra to to write the literal terms, x − y, to the left of the numerical term.

step-by-step explanation:

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225