Answer:
a₁ = -21 (Given)
a₂ = -28
a₃ = -35
a₄ = -42
Step-by-step explanation:
First term a₁ = -21 (Given)
…………………………………
Second term a₂ :
a₂ = [tex]a_{2-1} - 7\\a_{1} - 7\\a_{1} = -21\\-21 - 7 = -28[/tex]
…………………………………
Third term a₃ :
a₃ = [tex]a_{3-1} - 7\\a_{2} - 7\\a_{2} = -28\\-28 - 7 = -35[/tex]
…………………………………
Fourth term a₄ :
a₄ = [tex]a_{4-1} - 7\\a_{3} - 7\\a_{3} = -35\\-35 - 7 = -42[/tex]
