Question

If p2+ q2 = 25 and pq =12, find the value of 2(p+q)2 + 3(p-q)2
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Answer 1

Step-by-step explanation:

x – y = 13 and xy = 28, then find x2 + y2. (NCERT Exemplar, Q110, p237) (x–y)2 = x2–2xy + y2 (13)2 = x2 + y2 – 2 × 28 169 ... a3 + b3+c3–3abc (iii) (p–q) ( p2 + pq + q2) = p3–q3 (iv) (m + n) (m2 ...

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