(3x - y)(x + 7y)
(3x + y)(2x - 7y)
(3x + y)(x - 7y)
(3x - y)(2x + 7y)
Correct answer is A
(2x + 3y)2 - (x - 4y)2
= (2x + 3y)(2x + 3y) - (x - 4y)(x - 4y)
= 4x2 + 12xy + 9y2 - (x2 - 8xy+ 16y2)
= 4x2 + 12xy + 19y2 - x2 + 8xy - 16y2
= 3x2 + 20xy - 7y2
= 3x2 + 21xy - xy - 7y2
= 3x(x + 7y) - y(x + 7y)
= (3x - y)(x + 7y)
In how many ways can 6 subjects be selected from 10 subjects for an examination ...
Find the area of the trapezium above. ...
In the diagram, QP//ST:PQR = 34o qrs = 73o and Rs = RT. Find SRT ...
Given: U = {Even numbers between 0 and 30} P = {Multiples of 6 between 0 and 30} Q = {Multiples o...
The surface area of a sphere is 7927cm2. Find, correct to the nearest whole number, i...
A string is 4.8m. A boy measured it to be 4.95m. Find the percentage error. ...
if P and Q are fixed points and X is a point which moves so that XP = XQ, the locus of X is ...