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x1 + x2 = -b/a = -2/5
x1 . x2 = c/a = -1/5
20x1^2 + 20x2^2 = 20 (x1^2 + x2^2)
= 20 (x1 + x2)^2 - 2x1x2
= 20 (-2/5)^2 - 2 . -1/5
= 20 . 4/25 - (-2/5)
= 20/25 + 2/5
= 20/25 + 10/25
= 30/25
= 6/5
= 1 1/5
Maaf kalau salah