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sweet-ann [11.9K]
2 years ago
10

I need help with math ​

Mathematics
1 answer:
Sonbull [250]2 years ago
6 0

Answer:

6 is answer...............

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3/   7c2 d -7c = 4d -10

Step-by-step explanation:

combine like terms

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What is the value of y in the solution to the system of equations?
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The value of y is positive 8
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Write the phrase as an expression. Then evaluate when y=20 . 3 less than the quotient of a number y and 4
PtichkaEL [24]

Expression: <span>y÷4−3</span>

When <span><span>y=20</span><span>y=20</span></span>, the value of the expression is 2.

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Sally drives 66 miles in 3 hours and Molly drives 72 miles in 4 hours. What is the difference between their average speed, in mi
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Answer: A


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5 0
3 years ago
The roots of 2x^2-3x=4 are a and b. Find the simplest quadratic equation which has roots 1/a and 1/b
Tju [1.3M]
Find the roots

solve
we use hmm, completing the suare
2(x²-1.5x)=4
divide both sides by 2
x²-1.5x=2
take 1/2 of linear coeiftn and square it
-1.5/2=-0.75, (-0.75)²=0.5625
add that to both sides
x²-1.5x+0.5625=2+0.5625
factor perfect squaer trinomial
(x-0.75)²=2.5625
square root both sides, remember to take positive and negative square roots
x-0.75=+/-√2.5625
add 0.75 to both sides
x=0.75+/-√2.5625

the roots are x=0.75+√2.5625 and x=0.75-√2.5625

1/a and 1/b
1/(0.75+√2.5625) and 1/(0.75-√2.5625)

if the roots of a quadratic equation are r1 and r2 then it factors to
(x-r1)(x-r2)
so then we can factor our equation to be
(x-\frac{1}{0.75+\sqrt{2.5625}})(x-\frac{1}{0.75-\sqrt{2.5625}})

if we were to try and expand it, we would get
x²+0.75x-0.5
that's the simpliest equation with roots 1/a and 1/b where a and b are he roots of 2x²-3x=4


x²+0.75x-0.5 is answer
8 0
3 years ago
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