EXERCISE 6.2

Find the value of the expression $x^2-7x+2$ for $x=5$.

Find the value of the following expression for $a=2, b=-1$:

$2a-3b$

Find the value of the following expression for $a=2, b=-1$:

$a^2-b^2$

Find the value of the following expression for $a=2, b=-1$:

$a^2+3ab+b^2$

Find the value of the following expression for $a=2, b=-1$:

$a^2-2ab+b^2$

Write the following statement as a formula.

The perimeter of a regular pentagon ($P$) is $5$ times the length of its side($s$).

Write the following statement as a formula.

The selling price ($SP$) of an article is equal to the cost price ($CP$) of the article minus loss $\left(L\right)$.

If $x=3$, find the value of the following expression.

 $x-2$