Expand the Following: (X - 5) (X - 4)

Expand the following:
(x - 5) (x - 4)

बेरीज

(x - 5) (x - 4)
= x² -5x - 4x + 20
= x² - 9x + 20
(Using identify : (x - a) (x - b)
= x² - (a + b) x + ab).

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पाठ 3: Expansions - Exercise 4.1

पाठ 3 Expansions
Exercise 4.1 | Q 1.3

Expand the following, using suitable identity:

`[1/4a-1/2b+1]^2`

Write the following cube in expanded form:

(2x + 1)³

Evaluate the following using suitable identity:

(102)³

Factorise:

27x³ + y³ + z³ – 9xyz

Find the cube of the following binomials expression :

\[\frac{1}{x} + \frac{y}{3}\]

If a - b = 7 and ab = 18; find a + b.

Use the direct method to evaluate the following products :
(y + 5)(y – 3)

Find the squares of the following:
9m - 2n

If x + y = 9, xy = 20
find: x² - y².

If a² - 3a - 1 = 0 and a ≠ 0, find : `"a" - (1)/"a"`