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x2 + 8/11 = 5x - x2 - 5
x2+8 = 55x-11x2-55
x2 + 11x2 - 55x +63 = 0
12x2 -55x +63 = 0
D = b2-4ac
= (-55)^2-4 ×12 ×63
= 3025-3024
= 1
then , by quadratic formula,
x = -b+-rootD/2a
= -(-55)+-root1/2 × 12
= 55+-1/24
(1)case 1.
55+1/24 = 56/24 = 7/3
(2) case 2.
55-1/24 = 9/6 = 3/2
therefore x = 7/3 , 3/2
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