Question

the value of (2a+3b)(2a-3b).if a=2 and b = -1​

Answer 1

Value of ( 2a + 3b ) ( 2a - 3b )

By using the formula ( a + b ) ( a - b ) = a² - b²

( 2a )² - ( 3b )²

When a = 2 and b = -1

( 2 x 2 )² - ( 3 x - 1 )² = 4² - (-3)²

16 - 9 = 7

Answer ➡ 7

Answer 2

Answer:

7

Step-by-step explanation:

a=2

b=-1

(2*2+3*-1)(2*2-3*-1)

= 4+(-3)*4-(-3)

=4-3*4+3

=1*7

=7