87. If (5p - 4q) = 12 and pq=10, then find the value of 25p² + 16q²
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Answer:
25p² + 16q² = 164
Step-by-step explanation:
given (5p - 4q) = 12 and pq=10
consider , 25p² + 16q²
=> 25p² + 16q² = 5²p² + 4²q²
= (5p)² + (4q)²
= (5p-4q)² + 2(pq)
= 12² + 2(10)
= 144+20
= 164
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