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4 years ago

If a square has an area of 81 square how long is each side ?

1 answer:

7 0

The area of a square is

(length of a side) times (length of a side) .

So if you want to know the length of the side,
you have to find a number that gives you 81
when you multiply the number by itself.

That's called the "square root" of 81 .

Each side of your square is 9 units long.

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Write the quadratic equation whose roots are 3 and -1, and whose leading coefficient is 5.

Assoli18 [71]

Answer:

5x² - 10x - 15 = 0

Step-by-step explanation:

Given that the roots are x = 3 and x = - 1, then the factors are

(x - 3) and (x + 1) and the quadratic is the product of the factors, that is

f(x) = a(x - 3)(x + 1) ← a is a multiplier

Here a = 5, thus

f(x) = 5(x - 3)(x + 1) ← expand factors using FOIL

= 5(x² - 2x - 3) ← distribute parenthesis by 5

= 5x² - 10x - 15

Thus equation is

5x² - 10x - 15 = 0

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3 years ago

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Answer:

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3 years ago

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Elis [28]

Answer:

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Step-by-step explanation:

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Its worth committing this mnemonic to memory, which helps to find the required trig ratio:

SOH-CAH-TOA.

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Answer:

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Step-by-step explanation:

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