14.8k views
2 votes
Solve the problem. give that f(x)=4x²-7x;find all values of a such that f(a)=15 HELP!!!

1 Answer

3 votes

4x^2-7x=15\\ 4x^2-7x-15=0\\ 4x^2-12x+5x-15=0\\ 4x(x-3)+5(x-3)=0\\ (4x+5)(x-3)=0\\ x=-(5)/(4) \vee x=3
User Eriko
by
7.2k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories