Question

@4 using sutable identijy simpliliy the following
(i) (3x+4y)²
(ii)(x-7y)²
(iii)(pq-rd)²
​

Answer 1

Answer:

(3x−4y)

2

=(3x)

2

−2(3x)(4y)+(4y)

2

=9x

2

−24xy+16y

2

Answer 2

(i)

$= {(3x + 4y)}^{2}$

$= {(3x)}^{2} + 2 \times 3x \times 4y + {(4y)}^{2}$

$= {9x}^{2} + 24xy + 16 {y}^{2}$

(ii)

$= {(x - 7y)}^{2}$

$= {x}^{2} - 2x \times 7y + (7y) ^{2}$

$= {x}^{2} - 14xy + 49 {y}^{2}$