The area of a triangular poster is 84 square feet. Its height is 2 feet shorter than the length of its base. The formula for the area of a triangle is A=1/2bh. Find the height of the triangle.

Question

jiteshmeghwal9 · Answer

let the width be x. then$$\frac{1}{2} \times (2-x) \times (x)=(84)$$

anonymous · Answer

this isn't right

klimenkov · Answer

Let the height be $h$, then the base is $b=h+2$. Now solve equation
$\frac 12h(h+2)=84$

klimenkov · Answer

$h^2+2h-168=0$

anonymous · Answer

how did you get -168 from 84?

anonymous · Answer

I got $$h^{2}+1/2h-42$$

klimenkov · Answer

$\frac 12h(h+2)=84$
Multiply both parts on 2:
$2\cdot\frac 12h(h+2)=2\cdot84$
$h(h+2)=168$

anonymous · Answer

Ok, so remove the fraction from these problems. Thanks for your help.