7. (i) 25(a + b)2 – 16(a - b)2
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Answered by
1
25(a+b)^2 - 16(a-b)^2
=> [ 5(a+b)]^2 - [ 4(a-b)]^2
=> (5a +5b)^2 - (4a-4b)^2
=> (5a +5b - 4a +4b) ( 5a +5b +4a - 4b)
=> (a +9b) (9a+b)
Answered by
0
Answer:
{5(a+b)}²-{4(a-b)}²
{5(a+b)-4(a-b)}{{5(a+b)+4(a-b)}
{5a+5b-4a+4b} {5a+5b+4a-4b}
{a+9b} {9a+b}
Step-by-step explanation:
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