Question

factorise ques no 13,14,15,19,20,21
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Answer 1

In all questions, used Formula :

a² - b² = (a + b)(a - b)

×××××××××××××××××


(13) :

b⁴ - 100

(b²)² - 10²

(b² - 10)(b² + 10)


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(14) :

25 - a²x²

(5)² - (ax)²

(5 - ax)(5+ ax)

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(15) :

$144 - {a}^{6} \\ \\ {(12)}^{2} - ({a}^{3}) ^{2}$



(12 - a³)(12 + a³)

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(19) :

c² - 0.36

c² - (0.6)²

(c - 0.6)(c + 0.6)

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(20) :


${x}^{2} - \frac{1}{9} \\ \\ {x}^{2} - ( \frac{1}{3} ) ^{2} \\ \\ ( x + \frac{1}{3} )(x - \frac{1}{3} )$


(21) :

$\frac{4}{25} {m}^{2} - 64 \\ \\ ( \frac{2}{5}m ) ^{2} - {8}^{2} \\ \\ ( \frac{2m}{5} - 8)( \frac{2m}{5} + 8)$




I hope this will help you


(-;

Answer 2

I hope this answer will help you