Explanation:
a)
b)Let's factor x²+3x−28
⇒x²+3x−28
⇒x² - 4x + 7x - 28
⇒(x² - 4x) + (7x - 28)
⇒x( x - 4) + 7(x - 4)
⇒(x -4) (x + 7)
Answer:
(x−4)(x+7)
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