Question

factorise q² - 10q + 21​

Answer 1

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Question ⤵

factorise q² - 10q + 21

Answer ⤵

$q² - 10q + 21$

$by \: middle \: term \: splitting$

$= \: q {}^{2} - 3q - 7q + 21$

$(q {}^{2} - 3q) - (7q - 21)$

$q(q - 3) - 7(q - 3)$

$taking \: (q - 3) \: common$

$(q - 3)(q - 7)$

$\huge{ Ur Answer \: mate }$