Question

What is the solution set of 7x^2 + 3x = 0?
{0, 3/7}
{0, -3/7}
{0, -4/7}

Answer 1

You may factor out the "x" on left side first. Then equate each factor to zero.

Answer 2

so either\[7x ^{2}=0\] or \[3x=0\]

Answer 3

either use quadratic equation or factoring:
\[\large{\color{red}{\textbf{By factoring first}}}\]
\[\large{\color{blue}{7x^2+3x=0}}\]
\[\large{\color{green}{x(7x+3)=0}}\]
\[\large{\color{brown}{\textbf{Either x = 0 or 7x+3=0, can you find out the soln?}}}\]

Answer 4

so its -3/7 and 0?