GCE UPDATES

NECO GCE MATHS ANSWERS

NECO GCE MATHS ANSWERS

(7ai)
T₃ = -15
T₁₁ = 25
Tn = a+(n-1)
a+(3-1)d= -15
a+2d= -15 ….(i)
a+(11-1)d=25
a+10d=25 ….(ii)
Substract equatiom (i) from (ii)
a+2d = -15
– a+10d= 25
———————
8d = 40
d = 40/8
d = 5
Common difference (d)= 5

(7aii)
Substitute d in equ(i)
a+2d= -15
a+2(5)= -15
a+10= -15
a= -15-10
a= -25
First term (a)= -25

(7aiii)
Sₙ= ⁿ/₂ (2a+(n-1)d)
30=ⁿ/₂ (2x -25 + (n-1) 5)
30×2= n(-150 + 5n – 5)
60= -150n + 5n² – 5n
60= -155n + 5n²
5n² – 155n – 60 =0
n² – 11n – 12=0
n² – 12n + n – 12=0
n(n-12) +1(n-12)=0
(n-12)(n+1)=0
n-12=0 or n+1=0
n=12 or n=-1
Number of terms=12

(7b)
x = k/y²
2=k/4²
2×4² = k
k=32
x=32/y²
8=32/y²
8y²=32
y²=32/8
y²=4
y=±√4
y=±2
y=2

MyScholarshipBaze

I love surfing the web and providing great information for my readers. I am an Editor At Myscholarshipbaze.com

Share
Published by
MyScholarshipBaze

Recent Posts

Michael and Cecilia Ibru University (MCIU) Job Recruitment 2022

Michael and Cecilia Ibru University (MCIU) Job Recruitment 2022 Michael and Cecilia Ibru University (MCIU),…

2 hours ago

McPherson University Is Recruiting

McPherson University Is Recruiting McPherson University is an authorized private Christian foundation set up by…

6 hours ago

Lead City University Recruitment 2022

Lead City University (Lecturer I) Lead City University LCU is a Private tertiary institution approved…

8 hours ago

Nigeria Police force 2022 Recruitment process

Nigeria Police force 2022 Recruitment process The Nigerian police force is to recruit men into…

12 hours ago

Landmark University recruitment 2022

Landmark University recruitment 2022 Landmark University is a private University supported by the Federal Government…

16 hours ago

Obong University recruitment 2022

Obong University recruitment 2022 Obong University is a private college that is based on an…

22 hours ago