What is the sum of #3x^2 + x + 8# and #x^2 - 9#?
1 Answer
Mar 14, 2016
Explanation:
To obtain the sum of :
# 3x^2 + x + 8 + x^2 - 9 #
#color(blue)" collect like terms "# like terms are terms with the 'same' variable and power.
example :
# 5x^2 " and " 8x^2 " are like terms " # but
# 6x^2 " and " 3x " are not " # In the above expression
# 3x^2 " and " x^2 " are like terms "#
and can be collected by adding their coefficients ( the number values in front of them).the x term has no other terms with only x in them, and numbers are summed in the normal way.
#rArr 3x^2+x+8+x^2-9 = 4x^2 + x - 1 #