Expand : ( X + 8 )( X - 10 )

Expand : ( x + 8 )( x - 10 )

Sum

( x + 8 )( x - 10 ) = x² + ( 8 - 10 )x + 8 x (-10)
= x² - 2x - 80

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Expansion of Formula

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Chapter 4: Expansions - Exercise 4 (C) [Page 62]

Chapter 4 Expansions
Exercise 4 (C) | Q 1.2 | Page 62

Expand : ( x + y - z )²

Expand : `( x - 1/x + 5)^2`

If a² + b² + c² = 35 and ab + bc + ca = 23; find a + b + c.

If 2( x² + 1 ) = 5x, find :
(i) `x - 1/x`

(ii) `x^3 - 1/x^3`

If a² + b² = 34 and ab = 12; find : 7(a - b)² - 2(a + b)²

If x² + `x^(1/2)`= 7 and x ≠ 0; find the value of:
7x³ + 8x − `7/x^3 - 8/x`

The difference between two positive numbers is 4 and the difference between their cubes is 316.
Find : Their product

Find the value of 'a': 9x² + (7a - 5)x + 25 = (3x + 5)²

The sum of two numbers is 7 and the sum of their cubes is 133, find the sum of their square.

If 3a + 5b + 4c = 0, show that : 27a³ + 125b³ + 64c³ = 180 abc