Question

Which function should be graphed in order to solve the equation x2+2x=4
?(1 point)
Responses

f(x)=x2+2x+4

f left parenthesis x right parenthesis equals x squared plus 2 x plus 4

f(x)=x2+2x

f left parenthesis x right parenthesis equals x squared plus 2 x

f(x)=x2−2x

f left parenthesis x right parenthesis equals x squared minus 2 x

f(x)=x2+2x−4

Answer 1

f(x) = x^2 + 2x − 4

Reason: rewrite x^2 + 2x = 4 as x^2 + 2x − 4 = 0. Graphing f(x) = x^2 + 2x − 4 and finding its x-intercepts gives the solutions.