Question

Simplifying (3+2√5)(3-2√5)+11​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

$(a + b)(a - b) = {a}^{2} - {b}^{2}$

(3+2√5)(3-2√5)+11

=

${3}^{2} - (2 \sqrt{5})^{2} + 11$

= 9 - (4 × 5) + 11

= 9 - 20 + 11

= - 11 + 11

= 0