Question

(d) If a² + b2 = 9 and ab = 4.
Find the value of 3(a + b)2 -2(a - b)2.​

Answer 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

Answer 2

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