1) 7. Which function is equivalent to f(x)=x^2+7x-18 f(x)=(x+9)(x+2) f(x)=(x-9)(x+2) f(x)=(x-9)(x-2) f(x)=(x+9)(x-2)

To determine which function is equivalent to $f(x)=x^{2}+7x-18$, we need to factor the quadratic expression.<br /><br />The quadratic expression $x^{2}+7x-18$ can be factored as $(x+9)(x-2)$.<br /><br />Therefore, the function equivalent to $f(x)=x^{2}+7x-18$ is $f(x)=(x+9)(x-2)$.<br /><br />So, the correct answer is:<br />$f(x)=(x+9)(x-2)$