[填空题]
A toy racing car is driving over a hill on a path tcc4a2n feg0jjmbs q :,e6e ,y2hat ctq8cl7*vap0fmo:6f me(/ ci h4v a2sb:l n7 dgan be modelled by part of the 2ogf 8thimbfv/q :6a7cp lln47 cem: *s0(dvafunction
f(x)=-$\frac{1}{4}x^2+5$.
1.Find the gradient of the hill at the point where x=2.
f'(2)=- .
2.Find the x value of the point where the gradient perpendicular to the hill is equal to $\frac{3}{2}$.
the number is $\frac{a}{b}$ ,a= , b= .
