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Gnom [1K]
3 years ago
8

Solve the equation x(3x-8)=28

Mathematics
2 answers:
kicyunya [14]3 years ago
4 0
<span>Simplifying x(3x + -8) = 28 Re-order the terms: x(-8 + 3x) = 28 (-8 * x + 3x * x) = 28 (-8x + 3x2) = 28 Solving -8x + 3x2 = 28 Solving for variable 'x'. Reorder the terms: -28 + -8x + 3x2 = 28 + -28 Combin like terms: 28 + -28 = 0 -28 + -8x + 3x2 = 0 Factor a trinomial. (-2 + -1x)(14 + -3x) = 0
Hope this helped :)</span>
zhuklara [117]3 years ago
3 0
First distibute ussing distributive property which is a(b+c)=ab+ac so x(3x-8)=28 3x^2-8x=28 subtract 28 from both sides 3x^2-8x-28=0 if you can factor it then you get xy=0 then x and/or y=0 so to factor multiply first term and last term together so 3 times -28=-84 now find what 2 numbers will multiply to get -84 and add to get -8 factors of -84 -2,41 -3,28 -4,21 -6,14 -7,12 now add them together and find which ones add to 8 or -8 -2,41=39 -3,28=25 -4,21=17 -6,14=8 -7,12=5 the numbers are -14 and 6 group 3x^2+6x-14x-28 group (3x^2+6x)+(-14x-28) reverse distribute which is ab+ac=a(b+c) (3x)(x+2)+(-14)(x+2) reverse distribute again (3x+(-14) times (x+2) (3x-14)(x+2)=0 set each to zero 3x-14=0 x+2=0 3x-14=0 add 14 to both sides 3x=14 divide boh tisdes by 3 x=14/3 x+2=0 subtract 2 from both sides x=-2 x=14/3 and -2
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In ΔFGH, the measure of ∠H=90°, the measure of ∠F=44°, and GH = 14 feet. Find the length of HF to the nearest tenth of a foot.
inn [45]

Answer: 14.5 feet

Step-by-step explanation: that’s he correct answer delta math gave me AFTER I got it wrong

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3 years ago
Read 2 more answers
What is the perimeter of triangle ABC ?
blagie [28]

Answer:

9+\sqrt{41}

Step-by-step explanation:

From C-A, it goes from y=1 to y=5, so that 4 units

From A-B, it goes from x = -1 to x = 4, that is 5 units

Now, to find distance from B to C, we need to use the distance formula:

D=\sqrt{(y_2-y_1)^2+(x_2-x_1)^2}

Where the variables are the respective points of B and C,

B (4,5) & C(-1,1)

So x_1 =4, y_1=5, x_2=-1, y_2=1

Plugging into the formula we get:

D=\sqrt{(y_2-y_1)^2+(x_2-x_1)^2}\\D=\sqrt{(1-5)^2+(-1-4)^2}\\D=\sqrt{16+25}\\ D=\sqrt{41}

Summing it all (perimeter is sum of 3 sides):

Distance = 4+5+\sqrt{41}\\ =9+\sqrt{41}

3rd answer choice is right.

3 0
3 years ago
Harvey the wonder hamster can run 3 1/6 km in 1/4 hour harvey runs at a constant rate what is his average speed in kilometers pe
vampirchik [111]


1/4 times 4 is 1 hour so
3 1/6 times 4 is 12 2/3
3 0
3 years ago
Please help me with these questions. Thank you.
Bas_tet [7]

Answer:

36 x⁸y⁶

 √2/2

Step-by-step explanation:

Factor 1296 into its prime factors

           1296 = 24 • 34 

To simplify a square root, we extract factors which are squares, i.e., factors that are raised to an even exponent.

Factors which will be extracted are :

           1296 = 24 • 34 

No factors remain inside the root !!

To complete this part of the simplification we take the squre root of the factors which are to be extracted. We do this by dividing their exponents by 2 :

           36 = 22 • 32 

At the end of this step the partly simplified SQRT looks like this:

         36 √(x¹⁶y¹²)

STEP2:Simplify the Variable part of the SQRT

Rules for simplifing variables which may be raised to a power:

   (1) variables with no exponent stay inside the radical

(2) variables raised to power 1 or (-1) stay inside the radical

   (3) variables raised to an even exponent: Half the exponent taken out, nothing remains inside the radical. examples:

      √(x⁸)=x⁴

     √(x^-6)=x^-3

 

 Applying these rules to our case we find out that

      SQRT(x¹⁶y¹²) = x⁸y⁶

Combine both simplifications

      sqrt (1296x¹⁶y¹²) =  36 x⁸y⁶

Simplified Root : 36 x⁸y⁶ 

number 2)

3√2/3√4=

=3√2/3×2

=3√2/6

=3√2/6 ×3/3

=1√2/2

=√2/2

3 0
2 years ago
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