$$166 - [8^2 - 7^2 + \sqrt{(72 - 64 \div 8[18 \times 18 \div 324])}]$$
HERE, WE WILL USE BODMAS RULE. Bracket, Of, Division, Multiplication, Addition and Subtraction. It explains the order of operations to solve an expression.Â
$$166-[8^2 - 7^2 + \sqrt{(72 - 64 \div 8[18Â \times 1/18])}]$$Â Â { solving 18/324 = 1/18}
$$166-[8^2 - 7^2 + \sqrt{(72 - 64 \div 8[1])}]$$Â Â { solving 18*1/18}
$$166-[8^2 - 7^2 + \sqrt{(72 - 64 \div 8[1])}]$$Â Â {solving 64/8}
$$166-[8^2 - 7^2 + \sqrt{(72 - 8)}]$$Â Â {solving 64/8}
$$166-[8^2 - 7^2 + \sqrt{(64)}]$$Â Â {solving 72-8}
$$166-[8^2 - 7^2 + 8]$$Â Â {solving sqrt64}
$$166-[64-49+8]$$Â Â {solving 72-8}
$$166-[23]$$Â Â {solving bracket}
$$166-23$$Â Â
$$143$$Â Â
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