y=9x4+12x3−36x2+25
Differentiating,
dxdy=36x3+36x2−72x
=36x(x2+x−2)
=36x(x+2)(x−1)
Sign convention for dxdy

∴S1=−2,1 & {S}_{2}={0}
JEE Main 2019 — Mathematics Calculus
If S1 and S2 are respectively the sets of local minimum and local maximum points of the function, f(x)=9x4+12x3−36x2+25,x∈R, then
Held on 8 Apr 2019 · Verified 6 Jul 2026.
S1=−2;S2=0,1
S1=−1;S2=0,2
S1=−2,0;S2=1
S1=−2,1;S2=0
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