How do you add and subtract #3x^2 + 2x - 5# and #-4 + 7x^2#?

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Answer 1 · 2015-06-07T18:59:17

Addition:

#(3x^2+2x-5)+(-4+7x^2)#

#=3x^2+2x-5-4+7x^2#

#=3x^2+7x^2+2x-5-4#

#=(3+7)x^2+2x-9#

#=10x^2+2x-9#

Subtraction:

#(3x^2+2x-5)-(-4+7x^2)#

#=3x^2+2x-5+4-7x^2#

#=3x^2-7x^2+2x-5+4#

#=(3-7)x^2+2x-1#

#=-4x^2+2x-1#