How do you simplify #15x^2+1-[4(x^2-6)+5]#?

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Answer 1 · 2018-04-23T02:59:50

#11x^2+20#

#15x^2+1-[4(x^2-6)+5]#

#15x^2+1-[4x^2-24+5]#

#15x^2+1-4x^2+24-5]#

#11x^2+20#

Answer 2 · 2018-04-23T03:00:57

#11x^2-20#

We go through the inner parenthesis to the outer ones:
#4(x^2-6)=4x^2-24#
#4x^2-24+5=4x^2-19# #15x^2+1-(4x^2-19)=15x^2+1-4x^2+19#
#=11x^2-20#