Question

Good evening guys❤
Today's Question ✌
Q.By using Standard formula, expand the following:-
(i)(2x+7y)^2
(ii)(1/2x+2/3y)^2
(iii)(3x-1/2x)^2
Answer this simple question?
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Answer 1

Formula to be used :-

(a + b)² = a² + b² + 2ab

Solution :-

(i) (2x + 7y)²

= (2x)² + (7y)² + 2 × 2x × 7y

= 4x² + 49y² + 28xy

________________

(ii) (1/2x + 2/3y)²

= (1/2x)² + (2/3y)² + 2 × 1/2x × 2/3y

= 1/4 x² + 4/9 y² + 2/3 xy

________________

(iii) (3x - 1/2y)²

= (3x)² + (-1/2 y)² + 2 × 3x × -1/2 y

= 9x² + 1/4 y² + 6x × -1/2 y

= 9x² + 1/4 y² - 3xy

Answer 2

Answer:

= x2 + (a + b)x + ab to find the following products. (i ) (x + 3)(x + 7). (ii) (4x + 5)(4x + 1).