Question

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

Answer 1

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".

Answer 2

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

Answer 3

1x+6

Answer 4

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

(x + 6)(x + 7) = ?

Answer 5

Are you stuck?

Answer 6

46

Answer 7

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

Answer 8

thank you this is so confusing

Answer 9

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.

Answer 10

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

Answer 11

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.

Answer 12

ok thanks so much

Answer 13

You're very welcome and nice working with you!

Answer 14

And thx for the recognition! @TestTakingLifesaver

Good luck in all of your studies.