How do you solve this using quadtratic formula? (7x-2)^2=4
1 Answer
Mar 8, 2018
See method to obtain equation in form
Explanation:
First expand out the brackets:
in the original equation, we had a 4 on the right hand side, and we need a zero to apply the quadratic formula, so we subtract 4 from both sides, giving:
a factor of 7 can be taken out to leave:
Then the quadratic formula can be applied where
You can also solve easily without quadratic formula:
Factorise:
Two solutions:
The latter leads to