Question

step by step btado brainlist answer karduga
right answer 31 hai​

Answer 1

Given :- if a = 3 , find the value of 4a² - a - 2 ?

Solution :-

given that,

→ f(a) = 4a² - a - 2.

we need to find f(3) .

So,

→ f(3) = 4(3)² - 3 - 2

→ f(3) = 4 * 9 - 3 - 2

→ f(3) = 36 - 3 - 2

→ f(3) = 36 - 5

→ f(3) = 31 (Ans.)

Hence, value of given polynomial at a = 3 is 31.

Extra knowledge :-

• a² - b² = (a - b)(a + b)
• (a + b)² = a² + 2ab + b²
• a² + b² = (a + b)² - 2ab
• (a - b)² = a² - 2ab + b²
• (a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
• (a - b - c)² = a² + b² + c² - 2ab + 2bc - 2ca
• (a + b)³ = a³ + 3a²b + 3ab² + b³ = a³ + b³ + 3ab(a + b)
• (a - b)³ = a³ - 3a²b + 3ab² - b³ = a³ - b³ - 3ab(a - b)

Learn more :-

इस एक्स इक्वल टू रूट 3 प्लस वन डिवाइडेड बाय टू फाइंड द वैल्यू ऑफ एक्स क्यूब प्लस टू एक्स स्क्वायर माइनस 8 एक्स प्लस 7

https://brainly.in/question/20858452

if a^2+ab+b^2=25

b^2+bc+c^2=49

c^2+ca+a^2=64

Then, find the value of

(a+b+c)² - 100 = ...

https://brainly.in/question/16231132

Answer 2

Given :-

⠀⠀⠀⠀

• a = 3

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To Find :-

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• 4a² - a - 2 = ??

⠀⠀⠀⠀

Solution :-

⠀⠀⠀⠀

• putting the value of a in the eq

⠀⠀⠀⠀

4× 3² - 3 - 2

⠀⠀⠀⠀

4 × 9 - 3 - 2

⠀⠀⠀⠀

36 - 3 - 2

⠀⠀

36 - 5

⠀⠀⠀⠀

31

⠀⠀⠀⠀

Concept use :-

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• BODMAS

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B - bracket open

O - Of

D - Division

M - Multiplication

A - addition

S - Subtraction