Question

If P+q=10 and pq=5.Find the value bpf P²+q²

Answer 1

Answer:

p²+q² = 90

Step-by-step explanation:

p²+q²

= (p+q)² -2pq

= (10)² - 2×5 [ of p+q=10 and pq=5]

= 100 - 10

= 90

Answer 2

Answer:

90

Step-by-step explanation:

P² + Q² = (P + Q)² - 2PQ

[The above expression is from (a+b)² = a² + b² + 2ab ∴a² + b² = (a+b)² - 2ab]

p² + q² = 10² - 2 x 5

          = 100 - 10 = 90

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