Question 260670
{{{(sqrt(2y+3))^2}}}<br>
Since {{{sqrt(2y+3)}}} represents the (positive) expression you square to get 2y+3 and since we are squaring it, we should get 2y+3!<br>
Expressions like {{{sqrt(2y+3)}}} is supposed to be a positive number so we must make sure that 2y+3 is positive. But since 2y+3 is in a square root to begin with we know that it must be a positive number.<br>
To illustrate this issue, think about {{{sqrt(x^2)}}}. At first thought we might think this is equal to x. But x could be a negative number and {{{sqrt(x^2)}}} should be a positive number! So {{{sqrt(x^2) = abs(x)}}}