Mathematics

Show that x - 2 is a factor of 5x2 + 15x - 50.

Factorisation

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Answer

x - 2 = 0 ⇒ x = 2

∴ When given polynomial 5x2 + 15x - 50 is divided by x - 2, the remainder

= 5(2)2 + 15(2) - 50

= 5(4) + 30 - 50

= 20 + 30 - 50

= 0.

Hence, by factor theorem x - 2 is a factor of 5x2 + 15x - 50.

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