Who loves Math?
- Thread starter CrzyMeg
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Find x.
Hahaha.
Yes it can be. it didn't matter. I solve it. It depend root or equation. It can be use it.
...did you just distribute an exponent, and then use it as a multiple?
a^2 + b^2 = c^2
4^2 + 3^2 = ?^2
49 + 9 = 58^2
C = 7.62
That answer to find X.
4^2 =/= 49
Where's your work?
(a - 7)^2 + (a - 14)^2 = a^2
First, we rewrite equation
(a - 7)(a - 7) + (a - 14)(a - 14) = a^2
Next use First, Outer, Inner, Last (FOIL)
a * a + (-7)a + (-7)a + (-7)(-7) + a * a + (-14)a + (-14)a + (-14)(-14) = a^2
Then simplify
a^2 - 14a + 49 + a^2 - 28a + 196 = a^2
Combine like terms
2a^2 - 42a + 245 = a^2
Subract a^2 from each side:
a^2 - 42a + 245 = 0
Now we Factor trinomial
(a - 35)(a - 7) = 0
What happens here is, using FOIL again, we start with
(a - b)(a - c) = 0
Then we find what b and c are, their sum must be 42 and their product must be 245.
35 * 7 = 245
35 + 7 = 42
(35 - 35)(35 - 7) = 0, (7 - 35)(7 - 7) = 0 also.
So we have:
(35 - 7)^2 + (35 - 14)^2 = 35^2
28^2 + 21^2 = 35^2
784 + 441 = 1225
Or:
(7 - 7)^2 + (7 -14)^2 = 7^2
0 + -7^2 = 7^2
49 = 49
Oh, and technically when factoring at the end, it should be -42 sum and 245 product, so for that part it would actually be a -35 and a -7... but I didn't want to make it confusing.
In other words
(a + -35)(a + -7) = 0
But I didn't want to make a look like it could have been a negative for this.
Ah, and the actual answer for a is a = {7, 35}
In other words
(a + -35)(a + -7) = 0
But I didn't want to make a look like it could have been a negative for this.
Ah, and the actual answer for a is a = {7, 35}
Damn, I forgot something my remember. ahhhhhhhhhhhhh
sorry my wrong!
Let see
2x + 5(6) = 40
This is equation. Enjoy it!
Haha. I have to do this... sorry!
2x + 5(6) = 40
2x + 30 = 40
2x = 40 - 30
40 - 30 = 10
2x = 10
10 / 2 = 5
2x / 2 = x
x = 5
Here's another one, since I did both of yours...
5x + 16 = 41
Oh, and I noticed you were close with your answers, but maybe forgot a step somewhere... it's ok, I just started remembering this stuff again myself, hahaha.
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