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3 years ago

Which represents a quadratic function y=2(x+2)(x-1) in standard form

Mathematics

1 answer:

ale4655 [162]3 years ago

4 0

answer: y= 2x^2+2x-4
steps:
y= (2x+4)(x-1)
*FOIL method* y= (2x^2-2x+4x-4)
*simplify* y= 2x^2+2x-4

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Billy has some nickels and dimes worth $3.25. He has 3 times as many nickels as dimes. How many nickels does he have?

geniusboy [140]

$3d=n$

$10d+5n=325$

$10d+15d=325$

$25d=325$

$d=13$

$n=39$

Hope this helps.

頑張って!

5 0

2 years ago

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Estimate 24 x 2.31 ________ x ______=

Anna11 [10]

Answer:55.44

$24 x 2.31 equals 55.44$

Step-by-step explanation: I have do my work

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3 years ago

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9/20

NISA [10]

For this case we must find the solution of the following quadratic equation:

$x ^ 2 + 5x + 7 = 0$

Where:

$a = 1\\b = 5\\c = 7$

Then, the solution is given by:

$x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2a}$

Substituting the values:

$x = \frac {-5 \pm \sqrt {5 ^ 2-4 (1) (7)}} {2 (1)}\\x = \frac {-5 \pm \sqrt {25-28}} {2}\\x = \frac {-5 \pm \sqrt {-3}} {2}$

By definition we have: $i ^ 2 = -1$

$x = \frac {-5 \pm \sqrt {3i ^ 2}} {2}\\x = \frac {-5 \pm i \sqrt {3}} {2}$

Thus, we have two complex roots.

Answer:

The equation has no real roots.

4 0

3 years ago

Mrs. Smith decides to buy three sweaters and a pair of jeans. she had $120 in her wallet. if the price of jeans is $35, what is

mylen [45]

Answer:

The highest possible price of a sweater is $28.33

Step-by-step explanation:

We already know that price $j$ of jeans is $35.Let's say Mrs.Smith buys 3 sweaters for $p$ dollars each, and since her budget is $120 we have the inequality:

$3p+j\leq 120\\ \\\\=3p+35\leq 120$

Therefore

$p\leq 28.33$

Thus the maximum price of a sweater is $28.33

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3 years ago

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Factor as the product of two binomials.<br> 22 + 11x + 18

Dahasolnce [82]

Answer:

11x +40

Step-by-step explanation:

Add 22 and 18 and the result will be as above.

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3 years ago