## TestTakingLifesaver 2 years ago Which expression represents the area of the triangle? base=2x+12, height x+7 A) 3x + 19 B) 3x2 + 84 C) x2 + 13x + 42 D) 2x2 + 26x + 84

1. tcarroll010

A = bh/2 So, you would multiply the 2 expression for "b" and "h" (that are in "x") and divide by "2". Hint: It's easier to divide the "base" (or b) expression first by "2" and then simply multiply that by the expression for "h".

2. tcarroll010

So, what is the expression for for the base divided by "2"?

3. TestTakingLifesaver

1x+6

4. tcarroll010

Very good. So, now, all you have to do is multiply your answer by "x + 7" (x + 6)(x + 7) = ?

5. tcarroll010

Are you stuck?

6. TestTakingLifesaver

46

7. tcarroll010

When you have an expression like: (x + a)(x + b) It is: x(x + b) + a(x + b) = x^2 + bx + ax + ab = x^2 + (a + b)x + ab So, just substitute a = 6 and b = 7 in that last equation

8. TestTakingLifesaver

thank you this is so confusing

9. tcarroll010

Math can be, but if you take it step by step, it won't trick you. IMath is like a friend that speaks a foreign language.

10. TestTakingLifesaver

i'll practice and see if i can learn the langage

11. tcarroll010

That's a great attitude! You'll succeed if you stick with it. And you might want to go over that equality expansion a couple of times because it could clear things up for you.

12. TestTakingLifesaver

ok thanks so much

13. tcarroll010

You're very welcome and nice working with you!

14. tcarroll010

And thx for the recognition! @TestTakingLifesaver Good luck in all of your studies.