Simplify: 7x²(3x – 9) + 3 and find its values for x = 4 and x = 6
Answers
Answered by
7
Answer:
21x³ - 63x²
(i) 21 (4)³ - 6(4)²
= 1344 - 96
= 1248
(ii) 21(6)³ - 63(6)²
=4536- 2268
=2268
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Answered by
2
Answer:
Step-by-step explanation:
7x^2(3x-9)+3
=>21x^3+3
For x=4
=>21(4)^3+3
=>21×48+3
=>1006
For x=6
=>21(6)^3+3
=>21×216+3
=>4536+3
=>4539
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