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muminat
3 years ago
13

I am supposed to find the surface area. My answer is 378ft2. Is my answer correct?

Mathematics
1 answer:
Zepler [3.9K]3 years ago
4 0
I got 280ft^2. I multiplied the areas by 2 because the opposite sides are equal.

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Use the discriminant to determine the number of solutions to the quadratic equation 3x^2+5x=-1
kari74 [83]

Answer:

Two real distinct solutions

Step-by-step explanation:

Hi there!

<u>Background of the Discriminant</u>

The discriminant b^2-4ac applies to quadratic equations when they are organised in standard form: ax^2+bx+c=0.

All quadratic equations can be solved with the quadratic formula: x = \frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}}.

When b^2-4ac is positive, it is possible to take its square root and end up with two real, distinct values of x.

When it is zero, we won't be taking the square root at all and we will end up with two real solutions that are equal, or just one solution.

When it is negative, it is impossible to take the square root and we will end up with two non-real solutions.

<u>Solving the Problem</u>

<u />3x^2+5x=-1<u />

We're given the above equation. It hasn't been organised completely in ax^2+bx+c=0, but we can change that by adding 1 to both sides to make the right side equal to 0:

3x^2+5x+1=0<u />

Now that we can identify the values of a, b and c, we can plug them into the discriminant:

D=b^2-4ac\\D=(5)^2-4(3)(1)\\D=25-4(3)(1)\\D=25-12\\D=13

Therefore, because the discriminant is positive, the equation has two real, distinct solutions.

I hope this helps!

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3 years ago
A class sold tickets to their school play. Each of the 23 students in the class sold 4 tickets. The cost of each ticket was 7$
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92 tickets were sold
They made 368$
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Write an equation of the line passing through the points (4,10) and (-1,-15)
KATRIN_1 [288]

Answer:

Step-by-step explanation:

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3 years ago
,a,Please help me with this question
Maru [420]

ik i’m late but, 5/4 fabric or 1 1/4 fabric. :)

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2 years ago
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trapecia [35]

6 < x+5\leq11\qquad|\text{subtract 5 from every sides}\\\\1 < x\leq6\to x\in(1,\ 6]

8 0
3 years ago
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