Question

Using the quadratic formula to solve 7x2 – x = 7, what are the values of x?

Answer 1

its 'B' on 2020 edge

Explanation:

your welcome

Answer 2

`7x^2-x=7\\7x^2-x-7=0\\\\a=7;\ b=-1;\ c=-7\\\Delta=b^2-4ac\\\\\Delta=(-1)^2-4\cdot7\cdot(-7)=1+196=197 \ \textgreater \ 0\\\\therefore\\x_1=(-b-\sqrt\Delta)/(2a)\ and\ x_2=(-b+\sqrt\Delta)/(2a)\\\\x_1=(1-√(197))/(2\cdot7)=\boxed{(1-√(197))/(14)}\\\\x_2=(1+√(197))/(2\cdot7)=\boxed{(1+√(197))/(14)}`