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

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 4: Expansions - Exercise 4.1

पाठ 4 Expansions
Exercise 4.1 | Q 1.3

Evaluate the following using suitable identity:

(998)³

Simplify the following products:

`(1/2a - 3b)(1/2a + 3b)(1/4a^2 + 9b^2)`

Write in the expanded form (a² + b² + c² )²

Write in the expanded form: `(x + 2y + 4z)^2`

Evaluate the following:

(98)³

If \[\frac{a}{b} + \frac{b}{a} = 1\] then a³ + b³ =

Use the direct method to evaluate the following products :
(a – 8) (a + 2)

Use the direct method to evaluate :
`(3/5"a"+1/2)(3/5"a"-1/2)`

Find the squares of the following:

`(7x)/(9y) - (9y)/(7x)`

If m - n = 0.9 and mn = 0.36, find:
m² - n².