Negative difference

Find four arithmetic progression members between 7 and -6.

Correct result:

a2 =  4.4
a3 =  1.8
a4 =  -0.8
a5 =  -3.4

Solution:

${a}_{3}={a}_{2}+d=4.4+\left(-2.6\right)=\frac{9}{5}=1.8$
${a}_{4}={a}_{3}+d=1.8+\left(-2.6\right)=-\frac{4}{5}=-0.8$
${a}_{5}={a}_{4}+d=\left(-0.8\right)+\left(-2.6\right)=-\frac{17}{5}=-3.4$

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