Question

solve the question properly don't try to answer in short

Answer 1

We know, a^2 - b^2 = (a - b)(a + b)



So,

(4):

$\frac{ {(4.23)}^{2} - {(2.71)}^{2} }{4.23 - 2.71}$


Applying formula :

$\frac{(4.23 + 2.71)(4.23 - 2.71)}{4.23 - 2.71} \\ \\ \\ \frac{(4.23 + 2.71)}{1} \\ \\ \\ \\ 6.94$

Answer 2

hope this helps you and please mark as brainliest