add 3x-x²+11,2x and 1+x²
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The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.
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u have done wrong in last step...
-7x²-3x² must be -10x²....
in - and -, we add but sign remains negative.....
so recheck it.....
and also one more thing I want to tell that don't let 'x' becuz x is already in ur question...so put other letter....rather than 'x'.....u can take capital x 'X' or something other....
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and if something more question then u can ask.....
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