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Find the value of $ ( p + 2q)^2 - (p -2q)^2$ |
10pq 8 pq 4 pq 6 pq |
8 pq |
We know that, a2 - b2 = (a + b)(a - b). (p + 2q)2 - (p - 2q)2 = (p + 2q)2 - (p - 2q)2 = p2 + 4q2 + 4pq - p2 - 4q2 + 4pq = 8pq. |
