Question

find the value of
(a) 5a³-b³ (a=-2,b=3)
(b)x²-3(x=3)​

Answer 1

Answer:

(a) 5a³-b³

putting value

5×(-2)³- (3)³

5 × (-2)(-2)(-2) -(3×3×3)

-40-27

-67 ans .

(b) )x²-3 (x=3)

putting value of x

3×3 - 3

9-3

6 ans .

Answer 2

Answer:

Step-by-step explanation:

ANSWER:-

Concept:-

• Placement of x to their respective positions
• And then simplification
• Application of Algebraic Identities

Let's do!

$\sf{5a^3-b^3}$

$\sf{5(-2)^3-(3)^3}$

$\sf{(5 \times -8) - 27}$

$\sf{-40-27}$

$\boxed{\sf{=-67}}$

$\rm{x^2-3}$

$(3)^2-3$

$9-3$

$=6$

Things to Note:-

• Use of BODMAS in first part
• This states that we should perform division, multiplication, addition and subtraction sequentially.
• Odd powers give us same signs
• While even numbers change negative to positive always.