Simplification (√ m) & # 178; - (√ - n) & # 178=

Simplification (√ m) & # 178; - (√ - n) & # 178=

(√M)²-(√-N)²=M-(-N)=M+N;
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First simplify in job hunting 2 / X & # 178; - 9 △ 1 / x-3, where x = 2cos45 ° - 3

x=2cos45°-3
=2×√2/2-3
=√2-3
2/x²-9÷1/x-3
=2/(x+3)(x-3)×(x-3)
=2/(x+3)
=2/(√2-3+3）
=2/√2
=√2

First simplify, in the job: 3 (A-2) (a-6) - (a + 1) (2a-1), where a = 1

3(a-2)(a-6)-(a+1)(2a-1)
=3(a^2-8a+12)-2a^2+a-1
=a^2-23a+35
Because a = 1
So a ^ 2-23a + 35 = 13
So 3 (A-2) (a-6) - (a + 1) (2a-1) = 13