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3 years ago

LE

Mathematics

1 answer:

mr_godi [17]3 years ago

8 0

Answer:

216 cm²

Step-by-step explanation:

Area of ∆ACD = ½*CD*CA

CD = 24 cm

CA = ?

Use pythagorean theorem to find CA.

Thus:

CA² = AB² + BC²

Substitute

CA² = 10.8² + 14.4² = 324

CA = √324

CA = 18 cm

Area of ∆ACD = ½*CD*CA

Substitute

Area = ½*24*18

= 216 cm²

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Step-by-step explanation:

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Murrr4er [49]

Hello there! :)

Answer:

$\boxed{D$

*THE ANSWER MUST HAVE A POSITIVE SIGN!*

Step-by-step explanation:

First, you subtract by 8 from both sides of an equation.

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Then, you subtract by the numbers from left/right.

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$\boxed{D$ , is the CORRECT/FINAL ANSWER!

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3 years ago

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Answer:

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Step-by-step explanation:

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4 years ago

Perform the multiplication, (7x2+a2)(x2–3a2)

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Answer:

The given multiplied expression is

$(7x^2+a^2)(x^2-3a^2)=7x^4-20x^2a^2-3a^4$

Step-by-step explanation:

Given expression is $(7x^2+a^2)(x^2-3a^2)$

To find the multiplication of the given expression :

$(7x^2+a^2)(x^2-3a^2)$

By using the distributive property to solve the given expression as below

$(7x^2+a^2)(x^2-3a^2)=(7x^2)(x^2)+(7x^2)(-3a^2)+(a^2)(x^2)+(a^2)(-3a^2)$

$=7x^2.x^2-21x^2a^2+a^2x^2-3a^2.a^2$

$=7x^{2+2}-21x^2a^2+a^2x^2-3a^{2+2}$ ( by using the property $a^m.a^n=a^{m+n}$ )

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Adding the like terms in the above expression we get

$=7x^4-20x^2a^2-3a^4$

Therefore $(7x^2+a^2)(x^2-3a^2)=7x^4-20x^2a^2-3a^4$

Therefore the given multiplied expression is

$(7x^2+a^2)(x^2-3a^2)=7x^4-20x^2a^2-3a^4$

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4 years ago

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loris [4]

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3 years ago

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