Factorize each of the following expressions:
(i) x2 + 6x +8
(ii) x2 + 4x - 21
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Step-by-step explanation:
1) x² + 6x + 8
=> x² + 4x + 2x + 8
=> x(x + 4) + 2(x + 4)
=> (x + 4)(x + 2)
2) x² + 4x - 21
=> x² - 7x + 3x - 21
=> x(x - 7) + 3(x - 7)
=> (x - 7)(x + 3)
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