(d) If a² + b2 = 9 and ab = 4.
Find the value of 3(a + b)2 -2(a - b)2.
Answers
Answered by
1
Answer:
=17, 1 and 59
Step-by-step explanation:
=(a+b) = a²+ b²+ 2ab
= 9+2(4)
= 17
=(a-b)²= a² +b²- 2ab
= 9-2(4)
= 1
= 3(a+b) 2(a-b)
= 3(17) - 2(1)
=61-2
=59
hope it help
Answered by
3
Step-by-step explanation:
a ²+ b² =9
ab= 4
(a+b)²=a²+b²+2.a.b
=> 9+2×4
=>17
(a-b)² = a²+b²-2.a.b
=> 9-2×4
=> 1
3(a+b)² - 2(a-b)²
=>3×17 - 2×1
=>51 - 2
=> 49
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