Multiply the polynomials (5x^2 + 2x +8)(7x7 - 6)

If you mean the "x" is multiply, then your answer is 35x9+14x8+56x7−30x2−12x−48

Explanation:

=(5x2+2x+8)(7x7+−6)

=(5x2)(7x7)+(5x2)(−6)+(2x)(7x7)+(2x)(−6)+(8)(7x7)+(8)(−6)

=35x9−30x2+14x8−12x+56x7−48

=35x9+14x8+56x7−30x2−12x−48

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.