question number 20...
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Let,
The terms be
a-d, a, a+d
sum = 21
a - d + a + a + d = 21
3a = 21
a = 7...(1)
sum of squares = 165
(a - d)^2+ a^2 + (a + d)^2 = 165
3a^2+ 2d^2 = 165
3(7^2) - 165 = - 2d^2
d^2= 9
d = 3 , - 3
1st term = a = 7
2nd term = a +d = 7 +3 = 10
3rd term = a + 2d = 7+2×3=13
Let,
The terms be
a-d, a, a+d
sum = 21
a - d + a + a + d = 21
3a = 21
a = 7...(1)
sum of squares = 165
(a - d)^2+ a^2 + (a + d)^2 = 165
3a^2+ 2d^2 = 165
3(7^2) - 165 = - 2d^2
d^2= 9
d = 3 , - 3
1st term = a = 7
2nd term = a +d = 7 +3 = 10
3rd term = a + 2d = 7+2×3=13
kusum72:
can you write it in a copy and click a picture and post it....it will be more helpful..
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