What is the following product?

[tex]\[
(2 \sqrt{7} + 3 \sqrt{6})(5 \sqrt{2} + 4 \sqrt{3})
\][/tex]

A. [tex]\(6 \sqrt{10} + 16 \sqrt{2} + 42\)[/tex]

B. [tex]\(8 \sqrt{10} + 30 \sqrt{2} + 66\)[/tex]

C. [tex]\(7 \sqrt{14} + 6 \sqrt{21} + 16 \sqrt{3} + 21 \sqrt{2}\)[/tex]

D. [tex]\(10 \sqrt{14} + 8 \sqrt{21} + 30 \sqrt{3} + 36 \sqrt{2}\)[/tex]



Answer :

To solve the product [tex]\((2 \sqrt{7} + 3 \sqrt{6})(5 \sqrt{2} + 4 \sqrt{3})\)[/tex], we need to use the distributive property, which is often referred to as the FOIL method for binomials. This states that:

[tex]\[ (a + b)(c + d) = ac + ad + bc + bd \][/tex]

Applying this to our expression, we can break it down step-by-step:

1. Multiply [tex]\(2 \sqrt{7}\)[/tex] by [tex]\(5 \sqrt{2}\)[/tex]:
[tex]\[ 2 \sqrt{7} \times 5 \sqrt{2} = 2 \times 5 \times \sqrt{7 \times 2} = 10 \sqrt{14} \][/tex]

2. Multiply [tex]\(2 \sqrt{7}\)[/tex] by [tex]\(4 \sqrt{3}\)[/tex]:
[tex]\[ 2 \sqrt{7} \times 4 \sqrt{3} = 2 \times 4 \times \sqrt{7 \times 3} = 8 \sqrt{21} \][/tex]

3. Multiply [tex]\(3 \sqrt{6}\)[/tex] by [tex]\(5 \sqrt{2}\)[/tex]:
[tex]\[ 3 \sqrt{6} \times 5 \sqrt{2} = 3 \times 5 \times \sqrt{6 \times 2} = 15 \sqrt{12} \][/tex]
We need to simplify [tex]\(\sqrt{12}\)[/tex]:
[tex]\[ \sqrt{12} = \sqrt{4 \times 3} = 2 \sqrt{3} \][/tex]
Thus,
[tex]\[ 15 \sqrt{12} = 15 \times 2 \sqrt{3} = 30 \sqrt{3} \][/tex]

4. Multiply [tex]\(3 \sqrt{6}\)[/tex] by [tex]\(4 \sqrt{3}\)[/tex]:
[tex]\[ 3 \sqrt{6} \times 4 \sqrt{3} = 3 \times 4 \times \sqrt{6 \times 3} = 12 \sqrt{18} \][/tex]
Simplify [tex]\(\sqrt{18}\)[/tex]:
[tex]\[ \sqrt{18} = \sqrt{9 \times 2} = 3 \sqrt{2} \][/tex]
Thus,
[tex]\[ 12 \sqrt{18} = 12 \times 3 \sqrt{2} = 36 \sqrt{2} \][/tex]

Now, combine all the terms we have obtained:
[tex]\[ 10 \sqrt{14} + 8 \sqrt{21} + 30 \sqrt{3} + 36 \sqrt{2} \][/tex]

So, the expression simplifies to:
[tex]\[ 10 \sqrt{14} + 8 \sqrt{21} + 30 \sqrt{3} + 36 \sqrt{2} \][/tex]

Therefore, the correct answer is:

[tex]\[ \boxed{10 \sqrt{14} + 8 \sqrt{21} + 30 \sqrt{3} + 36 \sqrt{2}} \][/tex]