(L-2)The solution of x 2 − 4 x 2 − 5 x + 4 ≤ 1 is

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(L-2)The solution of ​ x 2 − 4 x 2 − 5 x + 4 ​ ​ ≤ 1 is

TestHub · Accepted Answer

− 1 ≤ x 2 − 4 x 2 − 5 x + 4 ​ ≤ 1 x 2 − 4 x 2 − 5 x + 4 ​ + 1 ≥ 0 x 2 − 4 2 x 2 − 5 x ​ ≥ 0 x ( 2 x − 5 ) ( x − 2 ) ( x + 2 ) ≥ 0 ​ ​ x 2 − 4 x 2 − 5 x + 4 ​ − 1 ≤ 0 x 2 − 4 x 2 − 5 x + 4 − x 2 + 4 ​ ≤ 0 x 2 − 4 8 − 5 x ​ ≤ 0 ( 8 − 5 x ) ( x 2 − 4 ) ≤ 0 ​ ​ ( x + 2 ) ( 5 x − 8 ) ( x − 2 ) ≥ 0 ( x + 2 ) ( 5 x − 8 ) ( x − 2 ) ≥ 0

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