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Simora [160]
4 years ago
9

Solve the equation.

Mathematics
2 answers:
AveGali [126]4 years ago
4 0
Ok, so if you have xy=0, then assume that x and y are equal to 0
so we have
(4n+5)(3n-7)=0
assue that
4n+5=0 and 3n-7=0

solve those
4n+5=0
minus 5
4n=-5
divide by 4
n=-5/4

3n-7=0
add 7
3n=7
divide 3
n=7/3




-5/4 and 7/3

2nd option

zvonat [6]4 years ago
3 0
You can set each equation to 0 so it would look like this:
And solve

4n+5=0. 3n-7=0
-5=-5. +7=+7

4n = 5. 3n = 7
4n/4 = 5/4. 3n/3 = 7/3
n = 5/4 n = 7/3

The first set of answers are the correct answers for n.
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Train completes journey of 150 miles one hour earlier if original speed is increased by 5mes/hour What is original speed
bija089 [108]
25mph.

using the equation distance = speed x time, you can make 2 equations. let x be the original speed of the train, and t be the original time it takes. the first equation is the original trip, the 2nd is your new speed and shortened time.
150=xt \\ 150=(x+5)(t-1)
this is because you are adding 5mph, and taking off 1 hour of time, to still cover the 150 miles. you can solve the first equation for t, and substitute into the second, and then solve for x.
t= \frac{150}{x}  \\ 150=(x+5)(t-1)=xt+5t-x-5 \\ 150=150+5( \frac{150}{x})-x-5 \\ 5= \frac{750}{x} -x \\ 5+x= \frac{750}{x}   \\ x^2+5x=750 \\ x^2+5x-750=0
and using the quadratic formula you can find x=25.
3 0
3 years ago
Will give brainlest if correct
Thepotemich [5.8K]

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7 0
3 years ago
Read 2 more answers
!!!!!!!!!!!!!!!!!!!!​
notsponge [240]

Option 3

The solution for given expression is \frac{(x - 4)(x - 4)}{(x + 3)(x + 1)}

<h3><u>Solution:</u></h3>

Given that we have to divide,

\frac{x^2 -16}{x^2 + 5x + 6} \div \frac{x^2 + 5x + 4}{x^2 -2x - 8}   ---- (A)

Let us first factorize each term and then solve the sum

Using a^2 - b^2 = (a + b)(a - b)

x^2 -16 = x^2 - 4^2 = (x + 4)(x -4)  ----- (1)

x^2 + 5x + 6 = (x + 2)(x + 3)   ----- (2)

x^2 + 5x + 4 = (x+1)(x + 4)   ---- (3)

x^2 -2x - 8 = (x-4)(x + 2)   ---- (4)

Now substituting (1), (2), (3), (4) in (A) we get,

\frac{(x + 4)(x -4)}{(x +2)(x +3)} \div \frac{(x+1)(x+4)}{(x-4)(x +2)}

To do division with fractions, we turn the second fraction upside down and change the division symbol to a multiplication symbol at the same time. Then we treat this as a multiplication problem, by multiplying the numerators and the denominators separately.

\frac{(x + 4)(x -4)}{(x +2)(x +3)} \times \frac{(x - 4)(x + 2)}{(x + 1)(x + 4)}

On cancelling terms we get,

= \frac{(x -4)(x-4)}{(x + 3)(x + 1)}

Thus option 3 is correct

6 0
4 years ago
Given h(x) = 2x – 3, find h(6).
Harrizon [31]

Answer:

h(6) = 9

Step-by-step explanation:

h(x) = 2x – 3,

Let x = 6

h(6) = 2*6 -3

       = 12 -3

       = 9

5 0
3 years ago
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Which expression is equivalent to 4-8x
Sliva [168]
The expression is equivalent tp 4x because if u simplify 8-4 u get 4 so the answer is 4x
8 0
4 years ago
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