Question

calcule:

$a) \\ \sqrt{5 {}^{2} - {4}^{2} }$

b)
${10}^{0 } - {5}^{2} + ( - 5 {}^{2} ) + {2}^{3}$
​

Answer 1

$\sqrt{ {5}^{2} - {4}^{2} } = \sqrt{25 - 16} = \sqrt{9} = 3 \\ \\ \\ {10}^{0} - {5}^{2} + ( - {5}^{2} ) + {2}^{3} = \\ 1 - 25 + ( - 25) + 8 = \\ - 24 - 25 + 8 = \\ - 49 + 8 = - 41$