4 years ago

What’s the mistake made in the steps to solve the equation below?

Mathematics

1 answer:

zzz [600]4 years ago

3 0

Answer:

The answer is A.

You are dividing by 8, not 10.

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I need to know how to simplify using conjugate

liubo4ka [24]

$\frac{4}{2 \sqrt{7}+ \sqrt{6} }$
Multiply denominator and numerator of fraction by conjugate (2√7 -6)
= $\frac{4(2 \sqrt{7})(- \sqrt{6}) }{(2 \sqrt{7} + \sqrt{6})(2 \sqrt{7} - \sqrt{6} ) }$
Expand using distributive property
= $\frac{8 \sqrt{7}- 4 \sqrt{6} }{28-2 \sqrt{42}+2 \sqrt{42} -6 }$
Collect like terms to simplify
= $\frac{8 \sqrt{7}-4 \sqrt{6} }{22}$

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4 years ago

Drag and drop the correct surface area to match the cube. cube with edge length = 3.2 m 12.8 m²19.2 m²51.2 m²61.44 m²

Ira Lisetskai [31]

- Surface Area of a Cube = 6(L)²
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4 years ago

How do you solve this?

Svetradugi [14.3K]

Use A^2+B^2=C^2 to get 20.2

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3 years ago