What is the sum of the polynomials? (7x3 – 4x2) + (2x3 – 4x2) 5x3 9x3 5x3 – 8x2 9x3 – 8x2

9x^3 - 8x^2

Step-by-step explanation:

We have to find the sum of the expression:

(7x3 – 4x2) + (2x3 – 4x2)

First of all we have to remove the parenthesis of both the expressions.

7x^3 - 4x^2 + 2x^3 - 4x^2

Now solve the values with same variable and exponent.

7x^3+2x^3 = 9x^3

-4x^2 - 4x^2 = -8x^2

So the expression we get after solving the expression is:

9x^3 - 8x^2

For my answer i got D) 9x^3-8x^2

Step-by-step explanation:

i dont know nkw

step-by-step explanation:

kenffledkedncklzkdfeserw

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.