Question

Expand (4−√5x)^2 using identities

Answer 1

Answer:

= 4² + (√5x)² - 2× 4 ×√5 [(a-b)² = a²+ b²- 2ab]

= 16 + 5x² - 8√5

= 5x² + 16 - 8√5

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Answer 2

Answer:

this is the answer...

Step-by-step explanation:

$(4 - \sqrt{5} x)^{2}$

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

then

$= 4^{2} - (2)(4)( \sqrt{5} x) + ( \sqrt{5} x)^{2}$

$= 16 - 8 \sqrt{5} x + 5x^{2}$