A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 2 years ago
a^2 – a – 20 can you help me solve this idk why I keep getting messed up on this
 2 years ago
a^2 – a – 20 can you help me solve this idk why I keep getting messed up on this

This Question is Closed

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0Set up two sets of parentheses: ( )( ) Place a on the left of each parentheses: (a )(a ) Your middle term is a which means 1a, and your last term is 20 Now look for two numbers that multiply to 20 and add to 1 What are they? That's what goes inside the parenteses on the right sides.

Loujoelou
 2 years ago
Best ResponseYou've already chosen the best response.1K so we have to factor a^2a20. We need to find two factors that when multiplied will equal 1 and when added equal 20. If we go through the factors of 20, we find that the two numbers that do this are 5 & 4. 5*4=20 & 5+4=1 so it fits what we're looking for. Now we put this in the two sets of parenthesis we have (a )(a ) and it becomes (a+4)(a5)

help123456
 2 years ago
Best ResponseYou've already chosen the best response.1wait y is one negative and one positive

Loujoelou
 2 years ago
Best ResponseYou've already chosen the best response.1Because we are looking for 2 numbers that multiply to get 20. A positive*positive=positive negative*negative=positive positive*negative=negative. So that means one of the numbers will be negative & the other positive. Also these 2 numbers have to add up to 1. The only two numbers that will meet this are 5 & 4. 5*4=20 and 5+4=1.

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0It's 5 and 4 because 5 x 4 = 20 and 5 + 4 = 1 So now those numbers go in the parentheses. (a  5)(a + 4) And you're done.
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.