Question

v.4 add and subtract polynomials 5ek
add.
$(6b^{3}+3b^{2}+9b+4)+(9b^{2}+4b+5)$
submit

Explanation:

Step1: Remove parentheses

$6b^3 + 3b^2 + 9b + 4 + 9b^2 + 4b + 5$

Step2: Combine like $b^3$ terms

$6b^3 + 3b^2 + 9b + 4 + 9b^2 + 4b + 5$

Step3: Combine like $b^2$ terms

$6b^3 + (3b^2+9b^2) + 9b + 4 + 4b + 5 = 6b^3 + 12b^2 + 9b + 4 + 4b + 5$

Step4: Combine like $b$ terms

$6b^3 + 12b^2 + (9b+4b) + 4 + 5 = 6b^3 + 12b^2 + 13b + 4 + 5$

Step5: Combine constant terms

$6b^3 + 12b^2 + 13b + (4+5) = 6b^3 + 12b^2 + 13b + 9$

Answer:

$6b^3 + 12b^2 + 13b + 9$