Question

Find the first four terms of an AP, whose first term is $-2$ and the common difference is $-2$.

Answer 1

Find the first four terms of an AP:

Here, the first term $a_1=-2$ and common difference $d=-2$.

$\begin{array}{cc}\Rightarrow & a_1=-2\end{array}$

$\begin{array}{rcl}& \Rightarrow & a_2=a_1+d\\ & =& -2-2\\ & =& -4\end{array}$

$\begin{array}{rcl}& \Rightarrow & a_3=a_2+d\\ & =& -4-2\\ & =& -6\end{array}$

$\begin{array}{rcl}& \Rightarrow & a_4=a_3+d\\ & =& -6-2\\ & =& -8\end{array}$

Hence, the first four terms of AP is $-2,-4,-6,-8$.