Evaluate 3ab - (a + b) (if a = 4 and b = 5)

Evaluate 3ab - (a + b) (if a = 4 and b = 5)
in Pre-Algebra Answers by

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

1 Answer

The answer is 336

The reason why is because 3ab is equal to 345. 
And (a + b) is eqaul to (4 + 5) 

So..
345 - ( 4+5) 
345 - 9
= 336

Hope this helps

by Level 10 User (57.4k points)

You got part of it right, but 3ab is 3*a*b=3*4*5=60. You got (4+5)=9 OK, so the answer would be 60-9=51. See what I mean? 345=3*100+4*10+5. But I'm pleased you had a go at answering. It's clear that you really want to help.

by Top Rated User (1.2m points)
Thanks Rod, by the way, I need help with some math homework today.
by Level 10 User (57.4k points)

Related questions

2 answers
Evaluate: 3ab - (a + b) (if a = 4 and b = 5)
asked Nov 18, 2015 in Pre-Algebra Answers by anonymous | 2.0k views
2 answers
Evaluate: 3ab - (a divided by b) (if a = 4 and b = 5)
asked Nov 17, 2015 in Pre-Algebra Answers by anonymous | 812 views
1 answer
evaluate the expression -b for b= -12
asked Sep 27, 2013 in Algebra 2 Answers by tesla shultz | 2.0k views
1 answer
evaluate 4x − 2y if x = −1 and y = −5
asked Jun 12, 2013 in Algebra 1 Answers by anonymous | 1.3k views
2 answers
Evaluate the expression y - 10 if y = 14.
asked Mar 28, 2012 in Pre-Algebra Answers by anonymous | 1.9k views
1 answer
Evaluate the expression
asked Oct 23, 2019 in Other Math Topics by Izabella | 536 views
1 answer
evaluate 12 C5
asked May 4, 2017 in Algebra 1 Answers by anonymous | 2.6k views
Welcome to MathHomeworkAnswers.org, where students, teachers and math enthusiasts can ask and answer any math question. Get help and answers to any math problem including algebra, trigonometry, geometry, calculus, trigonometry, fractions, solving expression, simplifying expressions and more. Get answers to math questions. Help is always 100% free!

Most popular questions within the last 3000 days

  1. 50+50-25X0+2+2= (19)
  2. it takes 10 road workers 5 days to complete a road repair when working 2 hours a day.Working at the same pace,how many days will it take 2 people working 5 hours a day to finish it? (3)
  3. Solve 15 -1(12÷4+1)? (4)
  4. 8:4(5+2) (3)
  5. How can i represent 1/3; 3/3; 7/3; 10/3 and 15/3 on a number line? (1)

Most popular tags

87,516 questions
100,279 answers
2,420 comments
732,474 users