Uhhh help me , i give brainliest

Mathematics

1 answer:

Yuri [45]3 years ago

6 0

Answer:

Step-by-step explanation:

x² + 12x - 40 = 0

x² + 12x = 40

Now, 12/2 = 6. So add 6² = 36 to each side

x² + 12x + 36 = 40 +36

top problems:

1-) x²-2x-8

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2-) 4s²-4s+1

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3-) 6x²-3-7x

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4-) 4u²+8u

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5-) t²-15

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6-) 3x²-x-4

bottom problems:

1-) $\frac{1}{4},-1$

y=x²+ $\frac{3x}{4}-\frac{1}{4}$

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2-) $\sqrt{2},\frac{1}{3}$

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3-) 0, √5

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4-) 1,1

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5-) $-\frac{1}{4}, \frac{1}{4}$

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6-) 4,1

7 0

3 years ago

Widget Wonders produces widgets. They

navik [9.2K]

Find the total cost of producing 5 widgets. Widget Wonders produces widgets. They have found that the cost, c(x), of making x widgets is a quadratic function in terms of x. The company also discovered that it costs $15.50 to produce 3 widgets, $23.50 to produce 7 widgets, and $56 to produce 12 widgets.
OK...so we have
a(7)^2 + b(7) + c = 23.50 → 49a + 7b + c = 23.50 (1)
a(3)^2 + b(3) + c = 15.50 → 9a + 3b + c = 15.50 subtracting the second equation from the first, we have
40a + 4b = 8 → 10a + b = 2 (2)
Also
a(12)^2 + b(12) + c = 56 → 144a + 12b + c = 56 and subtracting (1) from this gives us
95a + 5b = 32.50
And using(2) we have
95a + 5b = 32.50 (3)
10a + b = 2.00 multiplying the second equation by -5 and adding this to (3) ,we have
45a = 22.50 divide both sides by 45 and a = 1/2 and using (2) to find b, we have
10(1/2) + b = 2
5 + b = 2 b = -3
And we can use 9a + 3b + c = 15.50 to find "c"
9(1/2) + 3(-3) + c = 15.50
9/2 - 9 + c = 15.50
-4.5 + c = 15.50
c = 20
So our function is
c(x) = (1/2)x^2 - (3)x + 20
And the cost to produce 5 widgets is = $17.50

7 0

3 years ago

Hi can you help me pleaseeee?)

olganol [36]

<em>So to solve for a variable, you have to isolate that variable onto one side.</em>

Firstly, multiply both sides by j: $h-4=kj$