Question #d6521

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Answer 1 · 2017-04-22T15:32:17

#x^4+10x^2+30#

I am using this approach to show what is going on.

Let #color(green)(g(x)=a=x^2+5)#

so #" "color(brown)(g(color(white)(.)color(green)(g(x)color(white)(.)))->g(color(green)(a))=(color(green)(a)^2+5)#

Substitute for #a# giving

#a^2+5" "->" "(x^2+5)^2+5#

#" "x^4+10x^2+25+5#

#" "x^4+10x^2+30#