Plz help me to solve this problems – InterviewSolution

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Plz help me to solve this problems

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$15) \: prime \: factors \: of \: 42 \: is \: 2 \times 3 \times 7$

$16) \: square \: root \: of \: 6.25 \: is \: 2.5.$

$17)(i){x}^{2} +7x + 10 = (x + 2)(x + 5)$

$(ii) \: {x}^{2} - 5x - 14 = (x + 2)(x - 7)$

$(iii) \: {x}^{2} + 4x + 4 = (x + 2)(x + 2)$

$(iv) \: {x}^{2} - 4 = (x + 2)(x - 2)$

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