Factorise 7x^2-22x+3 by using identity
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Step-by-step explanation:
7x²-21x-x+3 = 0
7x(x-3)-1(x-3) = 0
(7x-1)(x-3) = 0
7x-1 = 0; x-3 = 0
x = 1/7,3
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7x² - 22x + 3
7x² - x(21 + 1) + 3
7x² -21x -x + 3 _ _ _ _ _ - _ _(take common)
7x(x - 3) -1(x - 3)
(7x - 1)(x - 3)
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