Question

Slove the following questions
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Answer 1

Answer:

$(1) \: \: 3 {x}^{2} + 2 \sqrt{21} x + 7$

$= ( { \sqrt{3x} )}^{2} + 2. \sqrt{3x} . \sqrt{7} +( { \sqrt{7} )}^{2}$

$=( { \sqrt{3} x + \sqrt{7}) }^{2}$

$(2) \: 20 {x}^{2} + 4 \sqrt{15} x + 3$

$= ( {2 \sqrt{5} x)}^{2} + 2 \times 2 \sqrt{5} x. \sqrt{3} + ( { \sqrt{3})}^{2}$

$= ( {2 \sqrt{5} x + \sqrt{3}) }^{2}$

Answer 2

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