Question

Find x if f(x)=2x+7 and f(x)=-1

Answer 1

`x = -4`

Explanation:

`~~~~~~f(x) = -1\\\\\implies 2x +7 = -1\\\\\implies 2x = -1 - 7\\\\\implies 2x = -8 \\\\\implies x = -\frac 82 \\\\\implies x = -4`