Question

c. 30 - [18 - {14 - (15 - 4 ÷ 2 x 2)}]
answer is 15

i need step by step explanation
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Answer 1

Step-by-step explanation:

$30 - (18 - {14 - (15 - 4 ÷ 2 {x}^{2} )}) \\ 30= (4 - (11 \div 2 {x}^{2} )) \\ 30 = (4 - 11 \div 2 {x}^{2} ) \\ 30 = ( - 7 \div 2 {x}^{2} ) \\30 = - 7 \div 2 {x}^{2} \\ 30 {x}^{2} = - 7 \\ {x}^{2} = - 7 \div 30 \\ x = \sqrt[2]{ - 7 \div 30}$