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Find the values of the following expressions for $${x}={2}.$$ (i) $${x}+{4}$$ (ii) $${4}{x}-{3}$$ (iii) $${19}-{5}{x}^{{2}}$$ (iv) $${100}-{10}{x}^{{3}}$$
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## QuestionMathsClass 7

Find the values of the following expressions for $${x}={2}.$$ (i) $${x}+{4}$$ (ii) $${4}{x}-{3}$$ (iii) $${19}-{5}{x}^{{2}}$$ (iv) $${100}-{10}{x}^{{3}}$$

(i) $${x}+{4}={2}+{4}={6}$$

(ii) $${4}{x}-{3}={4}{\left({2}\right)}-{3}$$

$$={8}-{3}={5}$$

(iii) $${19}-{5}{x}^{{2}}={19}{5}{\left({2}\right)}^{{2}}$$

$$={19}-{20}=-{1}$$

(iv) $${100}-{10}{x}^{{3}}$$

$$={100}-{10}{\left({2}^{{3}}\right)}$$

$$={100}-{80}={20}$$