Question

Solve. (See attachment)

Answer 1

a) \(5x^2=35 \implies x^2=7 \implies x=\pm \sqrt{7}\).
b) The x-intercepts of \(f(x)\) are the point at which \(f(x)=0\), that implies \(5x^2-35=0.\) You should be able to take it from here.