if m=3 and n=2 find the value of a)9m²-10³ b)2m³+3n²-5m²
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Answer:
(a) 1
(b) 21
Step-by-step explanation:
(a) 9m² - 10n³
Put m=3 and n=2 in 9m² - 10n³,
= 9(3)² - 10(2)³
= 9 × 9 - 10 × 8
= 81 - 80
= 1
(b) 2m³ + 3n² - 5m²
Put m=3 and n=2 in 2m³+3n²-5m²
= 2(3)³ + 3(2)² - 5(3)²
= 2 × 27 + 3 × 4 - 5 × 9
= 54 + 12 - 45
= 21
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