Question

What are the next three terms of the following sequence?
-10, 20, -40, 80

Answer 1

@mathstudent55 @akgorgeous

Answer 2

Do you see any pattern with this set of numbers?

Answer 3

yes, every other number is negative. Also, the first two numbers are 30 apart and the second two are 120 apart

Answer 4

@jim_thompson5910

Answer 5

if we had 10, 20, 40, 80, then what do you notice? Hint: multiplication by some fixed number happens each time

Answer 6

each one is multiplied by 2 oh my gosh thank you

Answer 7

yep so the pattern is to multiply each term by -2 to get the next term

Answer 8

-160, 320, -640, 1280

Answer 9

is that right?

Answer 10

you only need 3 terms, but you have the right idea. Nice job

Answer 11

ans is -160

Answer 12

each time it multiplies by -2 so 80 * -2 = -160... and so on. Hope I helped :) x