Simplify 3x (4x – 5) + 3 and find its values for (i) x = 3 (ii) x =1/2
Pawan Prajapati , 3 Years ago
Grade 12
8 grade maths> Simplify 3x (4x – 5) + 3 and find its val...
1 AnswersHarshit Singh
Last Activity: 3 Years ago
Dear Student
3x (4x – 5) + 3
=3x(4x)–3x(5) +3
=12x^2- 15x + 3
(i) putting a= 3 in the equationwe get
12x^2- 15x + 3 =12(3^2)–15 (3) +3
= 108–45 + 3 = 66
(ii)putting a=1/2 in the equation we get
12x^2- 15x + 3 = 12 (1/2)^2 – 15 (1/2) + 3
=12 (1/4) - 15/2 +3
= 3 - 15/2 + 3
= 6- 15/2
= (12- 15 ) /2
= -3/2
Thanks
Provide a better Answer & Earn Cool Goodies
Enter text here...
LIVE ONLINE CLASSES
Prepraring for the competition made easy just by live online class.
Full Live Access
Study Material
Live Doubts Solving
Daily Class Assignments
Ask a Doubt
Get your questions answered by the expert for free
Enter text here...
Other Related Questions on 8 grade maths
The sum of two numbers is 2490. If 6.5% of one number is equal to 8.5% of the other, find the numbers.
8 grade maths
1 Answer Available
Last Activity: 1 Year ago(s)
A machine P can print one lakh books in 8 hours, machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines started at 9 a.m while machine P closed at 11 a.m. and the remaining two machines complete the work. Approximately at what time will the work be finished?A. 11:30 a.mB. 12 noonC. 12:30 p.mD. 1 p.m
8 grade maths
1 Answer Available
Last Activity: 1 Year ago(s)
What number should be added to (7)/(12) to get (4)/(15) ?
8 grade maths
1 Answer Available
Last Activity: 2 Year ago(s)
2 men each working 5 hour per day can finish a job in 12 days. How long will 4 men each working 2 hours per day take to finish the same job?
8 grade maths
2 Answer Available
Last Activity: 2 Year ago(s)