What are the zeros of f (x) = x^2+x-20?

A. x=-2 and x=10

B. x=-10 and x=2

C. x=-5 and x=4

D. x=-4 and x=5

Question

Warren

Mathematics

28 February, 08:23

What are the zeros of f (x) = x^2+x-20?

A. x=-2 and x=10

B. x=-10 and x=2

C. x=-5 and x=4

D. x=-4 and x=5

+1

Answers (1)

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Orlando Hoffman · Answer 1

F (x) = x² + x - 20 = x² + 5x - 4x - 20 = x (x + 5) - 4 (x + 5) = (x + 5) (x - 4)

f (x) = 0 ⇔ (x + 5) (x - 4) = 0 ⇔ x + 5 = 0 or x - 4 = 0 ⇒ x = - 5 or x = 4

Answer: C. x = - 5 and x = 4.

What are the zeros of f (x) = x^2+x-20?A. x=-2 and x=10B. x=-10 and x=2C. x=-5 and x=4D. x=-4 and x=5

What are the zeros of f (x) = x^2+x-20?

A. x=-2 and x=10

B. x=-10 and x=2

C. x=-5 and x=4

D. x=-4 and x=5