Simplify using identities (2a+3b)^2 - (2a-3b)^2

24ab

Step-by-step explanation:

Here, the identity A² - B² = (A + B) (A- B) will be used ; A = 2a + 3b, b = 2a - 3b.

=> (2a + 3b + 2a - 3b) (2a + 3b - (2a - 3b))

=> (4a) (2a + 3b - 2a + 3b)

=> (4a) (6b)

=> 24ab

Hope it helps :)

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.