iunicornprincess iunicornprincess

18-09-2020
Mathematics

contestada

2. The sum of the third and the seventh terms
of an AP is 6 and their product is 8. Find
the sum of first sixteen terms of the AP.

Respuesta :

aryanjangra506 aryanjangra506

18-09-2020

Step-by-step explanation:

a3+a7=6

a+2d+a+6d=6

2a+8d=6

a+4d=3..... (1)

a+2d)(a+6d)=8

(3-4d+2d)(3-4d+6d)=8

(3-2d)(3+2d)=8

9-4d^2=8

d=1/2

a=1

s16=n/2 [2a+(n-1) d]

=8 (2+15/2)

=8×19/2

=76

Answer Link

Otras preguntas

an apple Orchard sells apples in bags of 10. the orchard sold a total of 2,430 apples one day. how many bags of apples was this ?

Four molecules have carbon as the central atom and hydrogen atoms around it. Which shape would give rise to a polar molecule?

The Law of Universal Gravitation: A. Produces stars and planets B. Produces stars but not planets C. Produces planets but not stars D. Cannot produce neither st

Which tools can be used for inductive reasoning select each correct answer a. Facts b.observation c. Deductive reasoning d. Experiment

ms.freise order 345 boxes of goldfish.there were 1000 gold fish in each box.if she wanted to share the goldfish equally between 10 clases how many goldfish woul

what type of shape is the red-circled part of this image called?the red-circled part of this image is called a ____ shape.

What is an enclosed body of coastal water that is a mixture of salt water and freshwater called?

How was geography one of the causes of the fall of the Aztecs?

in which case it is eassier to move a lawn roller???pulling or pushing???

Find 2x2 - 2z4 + y2 - x2 + z4 if x = -4, y = 3, and z = 2.