The factor of (〖2x〗^2 - 20x+42) is ______________
a) ( x-7)(x-3)
b) 2 ( x-7)(x-3).
c) ( x+7)(x+3)
d) 2 ( x+7)(x+3)
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★ Question ★
The factor of 2x² - 20x + 42 is ________ .
(a) (x - 7) (x - 3)
(b) 2 (x - 7) (x - 3)
(c) (x + 7) (x + 3)
(d) 2 (x + 7) (x + 3)
★ Answer ★
2x² - 20x + 42
= 2[x² - 10x + 21]
= 2[x² - 3x - 7x + 21]
= 2[x(x - 3) - 7(x - 3)]
= 2 (x - 7) (x - 3)
∴ The Option is (B) 2 (x - 7) (x - 3).
Regards,
CreativeAB
• The Genius •
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