plz plz plz plz plz help me
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1.
4ab(a² - 11a + 28)
4ab[a² - 7a - 4a + 28]
4ab[a(a - 7) - 4(a - 7)]
4ab (a - 7) ( a - 4)
2.
x² - 5x + 9/4
4x² - 20x + 9
4x² - 18x - 2x + 9
2x(2x - 9) - 1(2x - 9)
(2x - 1) (2x - 9)
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