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Anestetic [448]
3 years ago
5

The perimeter of a right angled triangle is 5 times the length of the shortest side. The numerical value of the area of the tria

ngle is 15 times the numerical value of the length of the shortest side. Find the lengths of all the three sides of the triangle.
Mathematics
1 answer:
olga55 [171]3 years ago
7 0
We write system of equations:

O = 5*a
P = 15*a
a,b,c =?
------------------
a + b + c = 5a             b + c = 4a
a*b/2 = 15a                 b/2 = 15

Now we calculate b and remaining sides:
b = 30

30 + c = 4a
c^2= 30^2 + a^2
(4a - 30)^2 = 900 + a^2
16a^2 - 240a + 900 = 900 + a^2
15a^2 = 240a
a = 16

that means that c = 4*16-30 = 34
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Answer:

Step-by-step explanation:

You asked: How do you know when to rewrite square trinomials and difference of squares binomials as separate factors? First, and mostly obviously is when the directions say to factor the given expression. Next, if you're given an equation and asked to solve it. You set it equal to 0 and factor the perfect square trinomial or the difference of squares binomial. Set each factor equal zero and solve. This is a little bit oversimplified but, solutions are roots are zeros are x-intercepts, so if you are asked to find any of those things. Set your equation equal to zero, factor and solve. Also, if you have a rational expression (a fraction with a polynomial on top and a polynomial on the bottom) you would need to factor in order to simplify, to sketch a graph without technology. Anytime you need to simplify, factoring is good to try.

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You can memorize how to factor these a^3 + b^3 = (a+b)(a^2 - ab + b^2) and

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