Find the square of:
$607$

368549

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368449

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368349

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368249

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Solution

The correct option is B 368449
$607$ can be written as $600 + 7$
$∴ 607^{2} = {(600 + 7)}^{2}$
It is the form of ${(a + b)}^{2}$ , where $a = 600, b = 7$
Applying the formula ${(a + b)}^{2} = a^{2} + b^{2} + 2 a b$
$607^{2} = {(600 + 7)}^{2} = 600^{2} + 7^{2} + 2 \times 600 \times 7 = 360000 + 49 + 8400 = 368449$

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Similar questions

Find the square of :

(i) $3 x + \frac{2}{y}$

(ii) $\frac{5 a}{6 b} - \frac{6 b}{5 a}$

(iii) $2 m^{2} - \frac{2}{3} n^{2}$

(iv) $5 x + \frac{1}{5 x}$

(v) $8 x + \frac{3}{2} y$

(vi) $607$

(vii) $391$

(viii) $9.7$

81 c m^{2}

σ_{1}^{2}

{1, 4, 7, 10, \dots, 301}

σ_{2}^{2}

{7, 13, 19, 25, \dots, 607}

\frac{σ_{2}^{2} - σ_{1}^{2}}{σ_{1}^{2}}

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