Question

15. (x² - 4x -21) = ?
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Answer 1

Answer:

x^2-4x-21=x^2-7x+3x-21

=x(x-7)+3(x-7)

=(x-7)(x+3)

x-7=0 or x+3=0

x=7 or x=-3

Answer 2

Answer:

(x+3)(x-7)

Step-by-step explanation:

By Middle Term Splitting

x2-7x+3x-21

x(x-7)+3(x-7)

(x+3)(x-7)

Hope it Helps,

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