3 years ago

If f(x) = x2 – 3x – 40 intersects the x-axis at points A and B, what is the sum of A and B?

Mathematics

1 answer:

Eduardwww [97]3 years ago

4 0

Answer:

Step-by-step explanation:

Intersections on the x axis occur when y = 0. f(x) is another term for y, so set f(x) equal to zero and solve for the two possible x's.

0 = x^2 - 3x - 40

0 = (x-8)(x+5)

By solving for x, you get 8 and -5. 8 and -5 added together will equal 3.

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