Question
If (x 2 = 10x – 25), then find the value of
[x³ + (x⁴/25)][7 - x³]Solution
x² = 10x - 25
⇒ x² - 10x + 25 = 0
⇒ (x - 5)² = 0
⇒ x = 5
Required value = [5³ + (5⁴/25)] × [7 - 5³]
= (125 + 25) × (-118)
= 150 × (-118) = -17700
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