The function 𝑓:𝑅→𝑅 𝑑𝑒𝑓𝑖𝑛𝑒𝑑 𝑏𝑦 𝑓(𝑥)=2x+2|x| is
a) one-one and onto   b) many-one and onto
c) one-one and into    d) many-one and into

 

Please give full explanation. Thank you

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