How do you multiply polynomials #(x^2 + 2x - 1)(x^2 + 2x + 5)#?
2 Answers
Mar 31, 2018
Explanation:
Just use a modified version of foil or a table
Just add them all up
Mar 31, 2018
#x^4+4x^3+8x^2+8x-5#
Explanation:
Given-
#(x^2+2x-1)(x^2+2x+5)#
#(x^2 xx x^2)+(2x xx x^2)-(1 xxx^2)+(x^2 xx 2x)+(2x xx 2x)-(1 xx 2x)+(x^2 xx5)+(2x xx5)-(1xx5)#
#x^4+2x^3-x^2+2x^3+4x^2-2x+5x^2+10x-5#
#x^4+2x^3+2x^3-x^2+4x^2+5x^2-2x+10x-5#
#x^4+4x^3+8x^2+8x-5#