(2^x+ 7)(x -5) -3 (x^2+ 5x)?

Question

mathstudent55 · Answer

First, multiply out the two binomial on the left using FOIL.
Then, distribute the -3.
Then combine like terms.

whpalmer4 · Answer

Expand it out and collect like terms.
Is that really 2^x and not x^2?

whpalmer4 · Answer

Also, when subtracting -3(x^2+5x) don't forget to change the sign on the 5x term as well.  That's a frequent mistake!

-3(x^2 + 5x) = -3x^2 -15x, NOT -3x^2 + 15x

whpalmer4 · Answer

Yeah, that must be x^2, not 2^x...

anonymous · Answer

all sides of a triangle are known to be intergers. Two of the sides of the triangle are 8 and 12. How many different values are there for the third side?

whpalmer4 · Answer

Don't put new problems in existing threads, open new questions instead.  And give medals if you expect additional help from people who answer your questions :-)

anonymous · Answer

okay thank you :)

mathstudent55 · Answer

(x^2+ 7)(x -5) -3 (x^2+ 5x) = 
x^3 -5x^2 + 7x - 35 - 3x^2 - 15x
Now collect like terms