Advertisements
Advertisements
Question
(5 + 20)(–20 – 5) = ?
Options
− 425
375
− 625
0
Advertisements
Solution
– 625
Explanation;
Hint: (50 + 20)(–20 – 5) = – (5 + 20)2
= – (25)2
= – 625
APPEARS IN
RELATED QUESTIONS
The difference of the squares, (612 – 512 ) is equal to ______.
(7x + 3)(7x – 4) = 49x2 – 7x – 12
Using suitable identities, evaluate the following.
(729)2 – (271)2
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/9 - y^2/25`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`(2p^2)/25 - 32q^2`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/25 - 625`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`(x^3y)/9 - (xy^3)/16`
The base of a parallelogram is (2x + 3 units) and the corresponding height is (2x – 3 units). Find the area of the parallelogram in terms of x. What will be the area of parallelogram of x = 30 units?
Verify the following:
(ab + bc)(ab – bc) + (bc + ca)(bc – ca) + (ca + ab)(ca – ab) = 0
The product of two expressions is x5 + x3 + x. If one of them is x2 + x + 1, find the other.
