Question

Solve x2 -10x = -21

x=7 and x=3
x=-7 and x=3
X=-7 and x=-3
X=7 and x=-3

Answer 1

x=7,x=3

Answer 2

Use factoring
\[\huge~\rm~ax^2+bx+c=0\]
This is the form we need to get our equation in
\[ \huge~\rm~x^2 -10x +21=0\]
I added the 21 so we get the eqution we are looking for Now we factor

What numbers multiply to make 21 but adds to make -10?

Answer 3

if you want to save your time,you can solve it through factorization.

Answer 4

First answer choice