Q) Show that 𝑓:𝑅_+→[−5,∞) given by 𝑓(𝑥)=4𝑥^2+4𝑥−5 is both one-one and onto where 𝑅_+=[0,∞).

Q) Show that a function f: R → R defined by f(x) = 2𝑥/(1+𝑥^2 ) is neither one-one nor onto.

90% FAIL! Percentage Square Root Trap I Percentage ka Square Root I Math Wali Class #mathstricks

Expanding Binomial Expressions 🥶 PART 1

Q) Show that the function 𝑓:𝑅→𝑅 defined by 𝑓(𝑥)=4𝑥^3−5,∀𝑥∈𝑅 is one-one and onto

🔥 Number System Divisibility Trick | Find Missing Digits in Seconds | Lakshmi Mam Best Shortcut #yt

Q) Let A = R – {5} and B = R – {1}. Consider the function f: A → B, defined by f(x) = (𝑥−3)/

Q) Check whether :Z×Z→Z×Z (where Z is the set of integers) defined as f(𝑥,y)=(2y,3𝑥) is injective

I never learned this square root trick in school !! #math #mathtricks #trending