15. (x² - 4x -21) = ?
Answers
Answered by
2
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
Answered by
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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