12. The factorization of 9x? - 3x - 20 is
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Answered by
43
⭐Ｓｏｌｕｔｉｏｎ:
9ｘ²-3ｘ-20=0
→ 9ｘ²-15ｘ+12ｘ-20=0
→ 3ｘ(3ｘ-5) +4(3ｘ-5) =0
→ (3ｘ+4) (3ｘ-5) =0
→ (3ｘ+4) =0 ＯＲ (3ｘ-5) =0
→ ｘ= -4/3 ＯＲ ｘ= 5/3
Answered by
1
Answer:
ANSWER
3, 15, 27, 39…….
a
n
=a+(n−1)d
a=3,d=15−3=12
n=54
a
54
=a+(n−1)d
=3+(54−1)×12
=3+53×12
=639
Term which is 132 more than its 54th term is – 639 +132 = 771.
a
n
=771
771=a+(n−1)d
771=3+(n−1)12
771=3+(n−1)12
64=n−1
n=65
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