Question

The height of a triangle is 5 m less than its base. The area of the triangle is 42 m2. Find the length of the base.



A.
11 m


B.
12 m


C.
8 m


D.
7 m

Answer 1

@pinkbubbles

Answer 2

Do you know the formula to solve the area of a triangle

Answer 3

hold on one sec

Answer 4

@pinkbubbles is going to help me you guys should help some other people

Answer 5

guys its ok :D

Answer 6

Area = (1/2)* base*height

Answer 7

thank you @aric200

Answer 8

ok now we can get down to business

Answer 9

Area = (1/2)* base*height
42 = (1/2)*x*(x-5)

Answer 10

84 = x^2 - 5x

Answer 11

now we have to factorize,
x^2 - 12x + 7x - 84 = 0
x(x-12) + 7(x-12) = 0
(x-12)*(x+7) = 0

Answer 12

so its D

Answer 13

no

Answer 14

12m

Answer 15

oh i was going to say 11 but yea your right