Question

$2 \times (5 {}^{2} - 12 {}^{2} \div 4 {}^{2} - \sqrt{49} =$
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Answer 1

$2( 5^2 - 12^2 \div {4}^{2} - \sqrt{49} \\ 2( {5}^{2} - {12}^{2} \div {4}^{2} - 7) \\ 2(25 - 144 \div 16 - 7) \\ 2(9) \\ 18$